vm_insnhelper.c: INLINE condition

* vm_insnhelper.c (INLINE): works with __NO_INLINE__ only,
  __clang__ is not the point.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54747 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_insnhelper.c

@@ -19,7 +19,7 @@
 /* control stack frame */
 
 #undef INLINE
-#if defined __GNUC__ && !defined __NO_INLINE__ && !defined __clang__
+#if defined __GNUC__ && !defined __NO_INLINE__
 #define INLINE inline
 #else
 #define INLINE static inline