WinRT: more renaming of "windowsrt" to "winrt"

include/SDL_config.h

@@ -32,7 +32,7 @@
 #if defined(__WIN32__)
 #include "SDL_config_windows.h"
 #elif defined(__WINRT__)
-#include "SDL_config_windowsrt.h"
+#include "SDL_config_winrt.h"
 #elif defined(__MACOSX__)
 #include "SDL_config_macosx.h"
 #elif defined(__IPHONEOS__)

include/SDL_main.h

@@ -44,7 +44,7 @@
    creating an instance of IFrameworkView in the process.
 
    Please note that #include'ing SDL_main.h is not enough to get a main()
-   function working.  The file, src/main/windowsrt/SDL_WinRT_main.cpp, or a copy
+   function working.  The file, src/main/winrt/SDL_WinRT_main.cpp, or a copy
    of it, must be compiled into the app itself.
 */
 #define SDL_MAIN_NEEDED