Move SDL_mslibc.c into the source file list
diff --git a/VisualC-WinRT/SDL-UWP.vcxproj.filters b/VisualC-WinRT/SDL-UWP.vcxproj.filters
index d788502..6599cda 100644
--- a/VisualC-WinRT/SDL-UWP.vcxproj.filters
+++ b/VisualC-WinRT/SDL-UWP.vcxproj.filters
@@ -842,5 +842,8 @@
<ClCompile Include="..\src\joystick\controller_type.c">
<Filter>Source Files</Filter>
</ClCompile>
+ <ClCompile Include="..\src\stdlib\SDL_mslibc.c">
+ <Filter>Source Files</Filter>
+ </ClCompile>
</ItemGroup>
-</Project>
+</Project>
\ No newline at end of file