internal.h: private rb_gc_mark_global_tbl
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
internal.h: private rb_gc_mark_global_tbl
but was accidentally exported.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e