dir.c: suppress a warning

* dir.c (to_be_ignored): remove duplicate inline modifier, and
  suppress a warning by VC.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56533 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

dir.c

@@ -1233,7 +1233,7 @@ sys_enc_warning_in(const char *func, const char *mesg, rb_encoding *enc)
  * ENOTDIR can be returned by stat(2) if a non-leaf element of the path
  * is not a directory.
  */
-ALWAYS_INLINE(static inline int to_be_ignored(int e));
+ALWAYS_INLINE(static int to_be_ignored(int e));
 static inline int
 to_be_ignored(int e)
 {