Generate 64 bit configurations in MSVC 8/9 projects.

Update bakefile configuration to include x64 configurations into MSVS 2005 and
2008 projects (2003 doesn't support building in 64 bits, 2010 and later are
manually maintained and already have them) and rebake the projects.

See #13675.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76767 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Mention the addition of x64 configs in MSVC 8/9 projects in the change log.

Should have been part of the previous commit.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76769 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775