Commit more often.

should implement less than or equal to (as the code does).

It caused: "Fatal Python error: UNREF invalid object" in the DoubleTest.

Some functions in the msvcrt module are skipped,
and socket.ioctl is enabled only when using a more recent Platform SDK.

(and yes, there are still companies that use a 10-years old compiler)

This should prevent some test_multiprocessing failures

Also remove references to odbc libraries, which are not shipped with vs2003 express.
(and certainly not useful)

if its UUID has lowercase letters.

keys in type dictionaries without using this locals() hack.

Document ctypes.util.find_library() and ctypes.util.find_msvcrt().