clib2 Code

- Elaborated on the unidirectional/bidirectional PIPE: issues.

- stdlib_unsetenv.c needs stdio_headers.h to compile properly.

- It's iswpunct() and not iswpunc().

- unsetenv() now returns a status value.

- Corrected the function prototype for wcspbrk().

- Added function prototypes for mbrtowc_l(), wcscoll_l(), wcscspn() and wcsrchr().

- Switched to BSD style options for the "cp" command, as used in the build
makefiles and the archive build script (that is: 'cp -a' becomes 'cp -p'
and 'cp -pR', depending upon the specific context).

This commit was manufactured by cvs2svn to create tag 'V1_203'.

*** empty log message ***

- Final checkin prior to upcoming release.

- Added 68k stubs to amiga_rexxvars.c for the OS4 build to use. The new code now
works just about exactly like the amiga.lib RVI code used to do, which means
that there is no artificial length limit for the number of characters a string
retrieved may have, and the code is largely reentrant.

- The 68k stub for StrcpyN stored d1 as a result value, which was both
dangerous and unnecessary.

- Plugged in 68k stubs for the OS4 build.