WinRT: Got OpenGL ES 2 working with the latest version of ANGLE/WinRT.

SDL/WinRT did have support for OpenGL ES 2 via an older version of ANGLE/WinRT,
however its API changed a few months ago, and SDL/WinRT would crash when trying
to use it.  It would also occasionally crash when using the older version.

This changeset should make SDL/WinRT work with the latest version, as
available via MS Open Tech's git repository of it at
https://github.com/msopentech/angle

Older versions of ANGLE/WinRT (from either https://github.com/stammen/angleproject
or https://bitbucket.org/DavidLudwig/angleproject) will need to be updated to
MS Open Tech's latest version.

VisualC-WinRT/SDL/SDL-WinRT_VS2012.vcxproj

@@ -324,7 +324,7 @@
     <ClInclude Include="..\..\src\video\SDL_blit_auto.h" />
     <ClInclude Include="..\..\src\video\SDL_blit_copy.h" />
     <ClInclude Include="..\..\src\video\SDL_blit_slow.h" />
-    <ClInclude Include="..\..\src\video\SDL_egl.h" />
+    <ClInclude Include="..\..\src\video\SDL_egl_c.h" />
     <ClInclude Include="..\..\src\video\SDL_pixels_c.h" />
     <ClInclude Include="..\..\src\video\SDL_rect_c.h" />
     <ClInclude Include="..\..\src\video\SDL_RLEaccel_c.h" />

VisualC-WinRT/SDL/SDL-WinRT_VS2012.vcxproj.filters

@@ -633,9 +633,6 @@
     <ClInclude Include="..\..\src\video\winrt\SDL_winrtopengles.h">
       <Filter>Source Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\video\SDL_egl.h">
-      <Filter>Source Files</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\include\SDL_opengles2.h">
       <Filter>Header Files</Filter>
     </ClInclude>
@@ -666,6 +663,9 @@
     <ClInclude Include="..\..\src\render\direct3d11\SDL_render_winrt.h">
       <Filter>Source Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\video\SDL_egl_c.h">
+      <Filter>Source Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="Header Files">