This requires Andrew Kuchling's zlib extension module.
It still needs some doc strings.

the value at configure time of the SGI_ABI environment variable.  See
abi(5).

when the pthread package is not installed.  configure knows better, so
#undef _POSIX_THREADS when pthread.h does not exist.

better than the old error API.

mymalloc.h.  (Since it's a macro, I don't care much.  It is used
internally only; others can use void *.)

Fixed typo in PyArg_VaParse (not PyArgs_*).

instead "posix.error" or "nt.error".

Jack's code).

cgen.py.  Now that cgen.py and cstubs have been quickly renamed, check
in the actual output.  This has some "old-style" names left in
(getilongarg etc.) but these are now take care of by macros in
cgensupport.h (which is now specific to glmodule.c).

Addeed Andrew Kuchling's zlib module.