cmake "ccache" warning change to info

Closes #167 (closed)

CMake/Cache.cmake

@@ -28,6 +28,6 @@ function(enable_cache)
         ${CACHE_BINARY}
         CACHE FILEPATH "C compiler cache used")
   else()
-    message(WARNING "${CACHE_OPTION} is enabled but was not found. Not using it")
+    message(STATUS "${CACHE_OPTION} is enabled but was not found. Not using it!")
   endif()
 endfunction()