Explicitly link MyGUI to it's dependencies

Again courtesy of "ld --no-add-needed" by Fedora 13.
	Maybe we should send this upstream to the MyGUI developers.

Signed-off-by: Josua Grawitter <josh@greyage.org>

extern/mygui_3.0.1/MyGUIEngine/CMakeLists.txt

@@ -24,3 +24,5 @@ if (MYGUI_USE_FREETYPE)
 		${FREETYPE_LIBRARIES}
 	)
 endif()
+
+target_link_libraries(${PROJECT_NAME} ${CMAKE_DL_LIBS} uuid)