tools/cnvwindeps.c:  Need to build this tool even on non-Cygwin platforms (either that or rethink the dependencies).

mkdeps.sh and mkdeps.bat have been deleted.  All configurations must now use the compiler mkeps program

Some networking logic was used helpers from apps/netutils.  Not good.  Quick fix is to duplicate logic

Some networking logic was used helpers from apps/netutils.  Not good.  Quick fix is to duplicate logic

tools/cnvwindeps.c: Add a tool that will convert dependencies created by a Windows native toolchain for use the Cygwin make

debug macros for AVR (take #2): Introduce arch-specific debug macro hooks

Make it possible for arch code to provide hook macros for NuttX dbg
that will lead to arch-specific syslog() and lowsyslog() variants.