xrGame: add *.cxx files in cmake

Author: eagleivg

cmake/utils.cmake

@@ -5,7 +5,7 @@ macro(add_dir DIRS)
     file( GLOB ${dir}__INCLUDES_H ${dir} ${dir}/*.h)
     file( GLOB ${dir}__INCLUDES_HPP ${dir} ${dir}/*.hpp)
     list( APPEND ${PROJECT_NAME}__INCLUDES ${${dir}__INCLUDES_H} ${${dir}__INCLUDES_HPP} )
-    file( GLOB ${dir}__SOURCES_CPP ${dir} ${dir}/*.cpp)
+    file( GLOB ${dir}__SOURCES_CPP ${dir} ${dir}/*.cpp ${dir}/*.cxx)
     file( GLOB ${dir}__SOURCES_C ${dir} ${dir}/*.c)
     list( APPEND ${PROJECT_NAME}__SOURCES ${${dir}__SOURCES_C} ${${dir}__SOURCES_CPP} )
   endforeach()