Added declaration of SDL_LogInit() and SDL_LogQuit()

Fixes compile warning on Android

VisualC-WinRT/SDL-UWP.vcxproj

@@ -145,6 +145,7 @@
     <ClInclude Include="..\src\SDL_hints_c.h" />
     <ClInclude Include="..\src\SDL_internal.h" />
     <ClInclude Include="..\src\SDL_list.h" />
+    <ClInclude Include="..\src\SDL_log_c.h" />
     <ClInclude Include="..\src\sensor\dummy\SDL_dummysensor.h" />
     <ClInclude Include="..\src\sensor\SDL_sensor_c.h" />
     <ClInclude Include="..\src\sensor\SDL_syssensor.h" />

VisualC-WinRT/SDL-UWP.vcxproj.filters

@@ -330,6 +330,9 @@
     <ClInclude Include="..\src\SDL_internal.h">
       <Filter>Source Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\src\SDL_log_c.h">
+      <Filter>Source Files</Filter>
+    </ClInclude>
     <ClInclude Include="..\src\locale\SDL_syslocale.h">
       <Filter>Source Files</Filter>
     </ClInclude>