Apply some fixes to SDL's cmakelists:

* Do a proper check for xinput support
* Enable OpenGL ES and EGL
* Don't try to link with the default set of libraries (since we don't want to link with the C runtime)
* Enable /arch:SSE to avoid linker errors

libs/SDL2/CMakeLists.txt

@@ -906,13 +906,23 @@ elseif(WINDOWS)
       endif()
       set(CMAKE_REQUIRED_FLAGS "/I\"$ENV{DXSDK_DIR}\\Include\"")
     endif()
+
+    if(HAVE_WIN32_CC)
+      # xinput.h may need windows.h, but doesn't include it itself.
+      check_c_source_compiles("
+        #include <windows.h>
+        #include <xinput.h>
+        int main(int argc, char **argv) { }" HAVE_XINPUT_H)
+    else()
+      check_include_file(xinput.h HAVE_XINPUT_H)
+    endif()
+
     check_include_file(d3d9.h HAVE_D3D_H)
     check_include_file(d3d11_1.h HAVE_D3D11_H)
     check_include_file(ddraw.h HAVE_DDRAW_H)
     check_include_file(dsound.h HAVE_DSOUND_H)
     check_include_file(dinput.h HAVE_DINPUT_H)
     check_include_file(xaudio2.h HAVE_XAUDIO2_H)
-    check_include_file(xinput.h HAVE_XINPUT_H)
     check_include_file(dxgi.h HAVE_DXGI_H)
     if(HAVE_D3D_H OR HAVE_D3D11_H OR HAVE_DDRAW_H OR HAVE_DSOUND_H OR HAVE_DINPUT_H OR HAVE_XAUDIO2_H)
       set(HAVE_DIRECTX TRUE)
@@ -1019,6 +1029,13 @@ elseif(WINDOWS)
       set(SDL_VIDEO_RENDER_OGL 1)
       set(HAVE_VIDEO_OPENGL TRUE)
     endif()
+    
+    if(VIDEO_OPENGLES)
+      set(SDL_VIDEO_OPENGL_EGL 1)
+      set(SDL_VIDEO_OPENGL_ES2 1)
+      set(SDL_VIDEO_RENDER_OGL_ES2 1)
+      set(HAVE_VIDEO_OPENGLES TRUE)
+    endif()
   endif()
 
   if(SDL_JOYSTICK)
@@ -1066,6 +1083,8 @@ elseif(WINDOWS)
     list(APPEND EXTRA_LDFLAGS "-mwindows")
     set(SDL_CFLAGS "${SDL_CFLAGS} -Dmain=SDL_main")
     list(APPEND SDL_LIBS "-lmingw32" "-lSDL2main" "-mwindows")
+  elseif(MSVC)
+    add_definitions(/arch:SSE)
   endif()
 elseif(APPLE)
   # TODO: rework this for proper MacOS X, iOS and Darwin support
@@ -1388,6 +1407,11 @@ if(SDL_SHARED)
       VERSION ${SDL_VERSION}
       SOVERSION ${LT_REVISION}
       OUTPUT_NAME "SDL2")
+    if(MSVC)
+      set_target_properties(SDL2 PROPERTIES LINK_FLAGS_RELEASE "/NODEFAULTLIB")
+      set_target_properties(SDL2 PROPERTIES LINK_FLAGS_DEBUG "/NODEFAULTLIB")
+      set_target_properties(SDL2 PROPERTIES STATIC_LIBRARY_FLAGS "/NODEFAULTLIB")
+    endif()
   endif()
  set(_INSTALL_LIBS "SDL2" ${_INSTALL_LIBS})
  target_link_libraries(SDL2 ${EXTRA_LIBS} ${EXTRA_LDFLAGS})