A small fix to add all the files and not just the first one CMake finds

cmake/OpenMWMacros.cmake

@@ -2,8 +2,11 @@
 macro (add_openmw_dir dir)
 set (files)
 foreach (u ${ARGN})
-list (APPEND files "${dir}/${u}.*")
-list (APPEND OPENMW_FILES "${dir}/${u}")
+file (GLOB ALL RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} "${dir}/${u}.*")
+foreach (f ${ALL})
+list (APPEND files "${f}")
+list (APPEND OPENMW_FILES "${f}")
+endforeach (f)
 endforeach (u)
 source_group ("apps\\openmw\\${dir}" FILES ${files})
 endmacro (add_openmw_dir)