foreach.c: printf specifier

* ext/-test-/st/foreach/foreach.c: get rid of hard coded "%lu",
  since st_data_t depends on the platforms.  use PRIuVALUE with
  casting VALUE instead since there is no specifier for it.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48249 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
tkutil.c: inherit Data

* ext/tk/tkutil/tkutil.c: use Data as super class, not to inherit
  useless methods.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e