Merge pull request #4994 from 0x6d61726b/patch-1

missing includes for filesystem.cpp (build with VisualGDB fails)

Author: theotherjimmy

features/filesystem/FileSystem.cpp

@@ -15,6 +15,8 @@
  */
 
 #include "mbed.h"
+#include "filesystem/Dir.h"
+#include "filesystem/File.h"
 #include "filesystem/FileSystem.h"
 #include <errno.h>