build: use GLES (not GL) when using emscripten, and disable SdlInput too.

src/lolgl.h

@@ -18,6 +18,11 @@
 
 #define GL_GLEXT_PROTOTYPES
 
+/* Prefer GLES on browsers */
+#if defined EMSCRIPTEN
+#   undef HAVE_GL_2X
+#endif
+
 /* Only define one GL platform */
 #if defined HAVE_GL_2X
 #   undef HAVE_GLES_2X

src/platform/sdl/sdlapp.cpp

@@ -100,7 +100,10 @@ SdlApp::SdlApp(char const *title, ivec2 res, float fps) :
      * advertised with the proper number of axes. */
     new D3d9Input();
 #   endif
+
+#   if !defined EMSCRIPTEN
     new SdlInput();
+#   endif
 #endif
 }