version.c: use str_new_static

* version.c (MKSTR): always make from static strings for sizeof
  operator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50807 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

version.c

@@ -18,7 +18,7 @@
 #endif
 
 #define PRINT(type) puts(ruby_##type)
-#define MKSTR(type) rb_obj_freeze(rb_usascii_str_new(ruby_##type, sizeof(ruby_##type)-1))
+#define MKSTR(type) rb_obj_freeze(rb_usascii_str_new_static(ruby_##type, sizeof(ruby_##type)-1))
 
 const int ruby_api_version[] = {
     RUBY_API_VERSION_MAJOR,