removed WinRT support.

build-scripts/fnsince.pl

@@ -119,12 +119,6 @@ $funcs{'SDL_DetachThread'} = '2.0.2';
 $funcs{'SDL_GL_ResetAttributes'} = '2.0.2';
 $funcs{'SDL_DXGIGetOutputInfo'} = '2.0.2';
 
-# these are incorrect in the dynapi header, because we forgot to add them
-#  until a later release, but are available in the older release.
-$funcs{'SDL_WinRTGetFSPathUNICODE'} = '2.0.3';
-$funcs{'SDL_WinRTGetFSPathUTF8'} = '2.0.3';
-$funcs{'SDL_WinRTRunApp'} = '2.0.3';
-
 if (not defined $wikipath) {
     foreach my $release (@releases) {
         foreach my $fn (sort keys %funcs) {