* Temp directory for all projects are now specific to the project
(rather than common as before).  This avoids any conflicts with
debug symbols or common file names etc.
NOTE: You should manually delete your existing build directory after
applying this patch, as the MSVC "clean" command will now only clean
the new temporary directories - not the existing common temp
directory.

* Base address for all extension modules updated. PC\dllbase_nt.txt
also updated.  Erroneous "libpath" directory removed for all
projects.

* winsound module moved from a builtin module to an extension
module.  This was done primarily to avoid Python16.dll needing to
pull in winmm.dll.  Really dumb test added for winsound - but if
nothing else it ensures the module imports.