Exclude SDL source files from .vcxproj if enable_sdl is "no".

src/lol-core.vcxproj

@@ -199,8 +199,12 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
-    <ClCompile Include="platform\sdl\sdlapp.cpp" />
-    <ClCompile Include="platform\sdl\sdlinput.cpp" />
+    <ClCompile Include="platform\sdl\sdlapp.cpp">
+      <ExcludedFromBuild Condition="'$(enable_sdl)'=='no'">true</ExcludedFromBuild>
+    </ClCompile>
+    <ClCompile Include="platform\sdl\sdlinput.cpp">
+      <ExcludedFromBuild Condition="'$(enable_sdl)'=='no'">true</ExcludedFromBuild>
+    </ClCompile>
     <ClCompile Include="profiler.cpp" />
     <ClCompile Include="scene.cpp" />
     <ClCompile Include="sprite.cpp" />
@@ -352,8 +356,12 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClInclude>
-    <ClInclude Include="platform\sdl\sdlapp.h" />
-    <ClInclude Include="platform\sdl\sdlinput.h" />
+    <ClInclude Include="platform\sdl\sdlapp.h">
+      <ExcludedFromBuild Condition="'$(enable_sdl)'=='no'">true</ExcludedFromBuild>
+    </ClInclude>
+    <ClInclude Include="platform\sdl\sdlinput.h">
+      <ExcludedFromBuild Condition="'$(enable_sdl)'=='no'">true</ExcludedFromBuild>
+    </ClInclude>
     <ClInclude Include="profiler.h" />
     <ClInclude Include="scene.h" />
     <ClInclude Include="sprite.h" />