cmake build fixes

this brings the cmake branch in line with commit
8e551bb287 from the main branch.

This adds a few boons, most notably it allows compiling on Linux with
SDL2 instead of SDL.

That also allows for mouse support and can now be run without X, which
is mostly interesting in case you want to play some Wagic on say, a
Raspberry Pi.

projects/mtg/CMakeLists.txt

@@ -109,6 +109,7 @@ set(MTG_generic_src
         src/WFont.cpp
         src/WGui.cpp
         src/WResourceManager.cpp
+        src/WParsedInt.cpp
         )
 
 set(MTG_network_src src/NetworkPlayer.cpp)

projects/mtg/src/SDLmain.cpp

@@ -155,9 +155,8 @@ public:
             return -1;
         }
 
-#ifdef __EMSCRIPTEN__
-        emscripten_set_main_loop(SdlApp::OneIter, 60, 1);
-#else
+        SDL_Event Event;
+
         while(Running)
         {
             if (g_engine)
@@ -180,7 +179,6 @@ public:
             }
         }
         OnCleanup();
-#endif
 
         return 0;
     }