-The test program and examples must be linked to SDL too when COGL is
built with the SDL renderer, so add configs accordingly.
-Also use Multibyte character sets (i.e. don't -DUNICODE) for all configs,
like what GLib does, for consistency.
-Fix the VS2010 property sheets that was accidently malformed.
(cherry picked from commit 9ed541b4e35208df87ffaa5fbbb39e11e8c247ef)