WinRT: renamed SDL_SYSWM_WINDOWSRT to SDL_SYSWM_WINRT

This is part of an overall effort to use the name, "WinRT", rather than "WindowsRT" (or "Windows RT"), as the shorthand name often seems to mean something different than the longhand name.  (WinRT is an API, Windows RT is a product name)

include/SDL_syswm.h

@@ -105,7 +105,7 @@ typedef enum
 {
     SDL_SYSWM_UNKNOWN,
     SDL_SYSWM_WINDOWS,
-    SDL_SYSWM_WINDOWSRT,
+    SDL_SYSWM_WINRT,
     SDL_SYSWM_X11,
     SDL_SYSWM_DIRECTFB,
     SDL_SYSWM_COCOA,

src/render/direct3d11/SDL_render_d3d11.cpp

@@ -583,7 +583,7 @@ D3D11_GetCoreWindowFromSDLRenderer(SDL_Renderer * renderer)
         return nullptr;
     }
 
-    if (sdlWindowInfo.subsystem != SDL_SYSWM_WINDOWSRT) {
+    if (sdlWindowInfo.subsystem != SDL_SYSWM_WINRT) {
         return nullptr;
     }
 

src/video/winrt/SDL_winrtvideo.cpp

@@ -230,7 +230,7 @@ WINRT_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)
     SDL_WindowData * data = (SDL_WindowData *) window->driverdata;
 
     if (info->version.major <= SDL_MAJOR_VERSION) {
-        info->subsystem = SDL_SYSWM_WINDOWSRT;
+        info->subsystem = SDL_SYSWM_WINRT;
         info->info.winrt.window = reinterpret_cast<IUnknown *>(data->coreWindow.Get());
         return SDL_TRUE;
     } else {