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.

    psock_close() and net_close() are internal OS functions and should not set the errno variable.

    psock_ioctl() and netdev_ioctl() are internal OS functions and should not set the errno variable.

    net_dupsd() and net_dupsd2() are internal OS functions and should not set the errno variable.

    net/ and fs/: net_vfcntl(), file_fcntl(), file_dup(), and file_dup2() are all internal OS interfaces and should not modify the errno value.

    net/: psock_recvfrom() is an internal interface and should not set the errno nor should it be a cancellation point.

    net/: psock_accept() is not a cancellation point.

    net/: psock_getsockopt() and psock_socket*9 are an internal interfaces and should not set the errno.

    net/: psock_getsockopt() is an internal interface and should not set the errno.

    net/: psock_listen() is an internal interface and should not set the errno.

    net/: psock_connect(( is an internal interface and should not set the errno nor should it be a cancellation point.

    net/: psock_bind() is an internal interface and should not set the errno.

    net/: psock_accept() is an internal interface and should not set the errno.

net/: Versions of psock_send() and pock_sendto() should not set errno.  That is taken care of at a higher level in the send()/sendto() implementation as appropriate.

syslog_console.c: fix typo

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

drivers/syslog:  syslog internal functions should not set the errno variable:  ramlog_putc(), syslog_dev_putc(), syslog_dev_write(), syslog_force().