sched/semaphore:  Add nxsem_post() which is identical to sem_post() except that it never modifies the errno variable.  Changed all references to sem_post in the OS to nxsem_post().

    sched/semaphore:  Add nxsem_destroy() which is identical to sem_destroy() except that it never modifies the errno variable.  Changed all references to sem_destroy() in the OS to nxsem_destroy().

    libc/semaphore and sched/semaphore:  Add nxsem_getprotocol() and nxsem_setprotocola which are identical to sem_getprotocol() and set_setprotocol() except that they never modifies the errno variable.  Changed all references to sem_setprotocol in the OS to nxsem_setprotocol().  sem_getprotocol() was not used in the OS

    libc/semaphore:  Add nxsem_getvalue() which is identical to sem_getvalue() except that it never modifies the errno variable.  Changed all references to sem_getvalue in the OS to nxsem_getvalue().

    sched/semaphore:  Rename all internal private functions from sem_xyz to nxsem_xyz.  The sem_ prefix is (will be) reserved only for the application semaphore interfaces.

    libc/semaphore:  Add nxsem_init() which is identical to sem_init() except that it never modifies the errno variable.  Changed all references to sem_init in the OS to nxsem_init().

    sched/semaphore:  Rename sem_tickwait() to nxsem_tickwait() so that it is clear this is an internal OS function.

    sched/semaphoate:  Rename sem_reset() to nxsem_reset() so that it is clear this is an internal OS function.

STM32L4 RTC, PM: small fixes to subseconds handling, ADC power-management hooks

* STM32L4 ADC: add PM hooks from Motorola MDK

* STM32L4 RTC: add up_rtc_getdatetime_with_subseconds

* STM32 RTC: workaround for potential subseconds race condition

    In all recent STM32 chips reading either RTC_SSR or RTC_TR is supposed to lock
    the values in the higher-order calendar shadow registers until RTC_DR is read.
    However many old chips have in their errata this silicon bug (at least F401xB/C,
    F42xx, F43xx, L15xxE, L15xVD and likely others):

    "When reading the calendar registers with BYPSHAD=0, the RTC_TR and RTC_DR
    registers may not be locked after reading the RTC_SSR register. This happens
    if the read operation is initiated one APB clock period before the shadow
    registers are updated. This can result in a non-consistency of the three
    registers. Similarly, RTC_DR register can be updated after reading the RTC_TR
    register instead of being locked."

* STM32L4 RTC: correct RTC_SSR and RTC_TR read ordering

    In all recent STM32 chips reading either RTC_SSR or RTC_TR is supposed to lock
    the values in the higher-order calendar shadow registers until RTC_DR is read.
    Change the register read ordering to match this and don't keep a workaround
    for a hypothetical race condition (not in any L4 errata, lets for once assume
    ST's silicon works as it is documented...)

* STM32L4 PM: remove useless #ifdefs and old non-L4 STM32 code

Approved-by: Gregory Nutt <gnutt@nuttx.org>

syscall/:  The non-standard interface exec() is now enshrined as a official NuttX API.  I really dislike doing this but I think that this is probably the only want to load programs in the protected mode.  It is currently used by some example code under apps/ that generate their own symbol tables for linking.  Other file execution APIs relay on a symbol table provided by the OS.  In the protected mode, the OS cannot provide any meaning symbol table for execution of code in the user-space blob so that is they exec() is really needed in that build case.  And, finally, the interface is completely useless and will not be supported in the KERNEL build mode where the contrary is true:  An application process cannot provide any meaning symbolic information for use in linking a different process.

    binfmt: Fix some compilation issues introduced in previous changes.  Verfied with the STM32F4-Discovery ELF configuration.

    binfmt:  schedule_unload() is an internal OS function and must not alter the errno variable.

    binfmt:  unload_module() is an internal OS function and must not alter the errno variable.

    binfmt:  load_module() is an internal OS function and must not alter the errno variable.

    binfmt:  exec_module() is an internal OS function and must not alter the errno variable.

Add support for Micron MT25Q series MT25Q128

Approved-by: Gregory Nutt <gnutt@nuttx.org>

commit b2ea300b broke the STM32L4 port for people not using the L496xx or L4A6xx.  That was because stm32l4_sdmmc.h is included from the stm32l4.h global header, and this header fires an #error for other chips.  I see that ALL stm32l4 have the same SDMMC except the stm32l4x2, which has none.

tools/:  configure.sh and configure.c should redirect stdout to /dev/null but should not suppress stderr output.

tools/configure.sh:  Another fix for the script.  The last change only worked for Windows Cygwin; for Linux, it needed to remove some additional things from the defconfig file.

stm32_hrtim: add support for capture, chopper, deadtime and dump registers

Approved-by: Gregory Nutt <gnutt@nuttx.org>

tools/configure.sh: Add special support so that you can start with a a windows native configuration and install on a different host (and vice versa).

compiler.h, limits.h, types.h:  Update SDCC/z80 files to include support for long long, inline, __FILE__, and __func__.

    configs/z80sim and xtrs:  Serial driver lower halfs ioctl methods should return a negated errno value, not set the errno variable.

    drivers/wireless:  CC1101 driver not permitted to set errno.

    drivers/sensors:  LIS331DL driver not permitted to set errno.

    drivers/lcd: ILI9341 initialize method not permitted to set errno,

    drivers/serial: 16550 UART driver IOCTL method must not set errno; it must return a negated errno value.

    STM32, STM32 F7:  LTDC and DMA2D drivers are not permitted to set the errno.

    SIM LPC31xx:  Serial and console drivers are not permitted to set the errno.

    SAMv7, STM32, STM32 L4:  DAC and ADC drivers are not permitted to set the errno.