[OWC libc] Add Watcom headers to libc, add 'make owc c86' #2158
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Fixes build confusion issues from @toncho11, discussed in #2112 (comment).
Adds stdarg.h and other headers required to build ELKS C library into libc/include/watcom/.
Adds the capability to build OpenWatcom C library using "make owc" from top level.
Adds the capability to build C86 C library (after building OpenWatcom library and 8086 toolchain) using "make c86" from top level.
The $WATCOM/h header files are no longer required to be installed to build the OpenWatcom C library on ELKS, nor to build the 8086 toolchain tools using OpenWatcom.