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.

about the file's obsolescence.

Added symlinks option to copytree.

Remove unneeded check for '.' / '..' from copytree().
Add some comments.

them in a finally clause.