Reviewed by Amaury Forgeot d'Arc.

won't fail with ERROR_CALL_NOT_IMPLEMENTED on win NT.
Reviewed by Amaury Forgeot d'Arc.

Cumulative patch to http and xmlrpc

extensions are installed.

during the function call setup.

This even gives a slight speedup, probably because tuple allocation
is faster than PyMem_NEW.

Functionally equivalent, clearer code, English comments.

Move the newly introduced disable_nagle_algorithm flag into the StreamRequestHandler, where it is more appropriate.

The changes in mcast.py come from the first version of the patch for issue5379.

error was thrown from itself in order to decide if the module can't be
found.  Thanks to Lucas Prado Melo for collaborating on the fix and tests.