FindGTK2: Do not fail on MSVC11 if vc100 libraries are available

Modules/FindGTK2.cmake

@@ -269,6 +269,9 @@ function(_GTK2_FIND_LIBRARY _var _lib _expand_vc _append_version)
             set(_library   ${_library}-vc90)
         elseif(MSVC10)
             set(_library ${_library}-vc100)
+        elseif(MSVC11)
+            # Up to gtkmm-win 2.22.0-2 there are no vc110 libraries but vc100 can be used
+            set(_library ${_library}-vc100)
         endif()
         set(_library_d ${_library}-d)
     endif()