Second attempt to fix more Github compiles.

Author: Doug-Lyons

win32ss/user/user32/CMakeLists.txt

@@ -5,7 +5,8 @@ include_directories(
     ${REACTOS_SOURCE_DIR}/sdk/include/reactos/subsys
     include
     ${REACTOS_SOURCE_DIR}/sdk/include/reactos/wine
-    ${REACTOS_SOURCE_DIR}/win32ss/include)
+    ${REACTOS_SOURCE_DIR}/win32ss/include
+    ${REACTOS_SOURCE_DIR}/sdk/include/reactos/libs/libpng)
 
 list(APPEND SOURCE
     controls/appswitch.c

win32ss/user/user32/windows/cursoricon.c

@@ -7,7 +7,7 @@
  */
 
 #include <user32.h>
-#include "libs\libpng\png.h"
+#include "png.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(cursor);
 WINE_DECLARE_DEBUG_CHANNEL(icon);