Enquote WINDOWS_ICON_PATH

cmake/platforms/windows.cmake

@@ -28,7 +28,7 @@ endif()
 list(APPEND CLIENT_DEFINITIONS USE_ICON)
 
 set_source_files_properties(${SOURCE_DIR}/sys/win_resource.rc
-    PROPERTIES COMPILE_DEFINITIONS WINDOWS_ICON_PATH=${WINDOWS_ICON_PATH})
+    PROPERTIES COMPILE_DEFINITIONS WINDOWS_ICON_PATH="${WINDOWS_ICON_PATH}")
 
 if(MSVC)
     # We have our own manifest, disable auto creation