Setting PlatformToolSet to v110_xp instead of default v110 in Visual Studio 2012 for Windows XP support, leaving default v100 in Visual Studio 2010.
Setting Windows app title for non-Debug mode, also.
Detect VS2012 Update 1
Detect VS2012 Update 1
Merge remote branch 'upstream/gles20' into gles20
Merge pull request #1824 from johnangel/gles20

fixed #1627: Enable Windows XP support in Visual Studio 2012 Update 1.