Support Visual Studio 2010

[krisvale]

http://bugs.python.org/review/13210/diff/4802/16999
File PC/msvcrtmodule.c (right):

http://bugs.python.org/review/13210/diff/4802/16999#newcode499
PC/msvcrtmodule.c:499: /* TODO-BC: the following 3 are from VS2008, may want to
remove? */
Probably not remove, if we want to maintain support for 2008, e.g. in PC/VC9
dierectory.

VS2010 no longer has SxS stuff, so they are probably gone.
Btw, hyou will want to define "st" locally, otherwise you get unused variable
warning

http://bugs.python.org/review/13210/diff/4802/16999#newcode524
PC/msvcrtmodule.c:524: st = PyModule_AddObject(m, "CRT_ASSEMBLY_VERSION",
version);
Not sure about the "ASSEMBLY" here, again, 2010 does not use manifests for the
crt (SxS, assemblies, etc)