(low cost) way to check whether the Tcl interpreter was compiled
with threads enabled of not.
* ext/tk/tcltklib.c: reduce warnings.
* ext/tk/tkutil/tkutil.c: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@9512 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
interpreter after initialization is done. [ruby-dev:27638]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@9507 b2dd03c8-39d4-4d8f-98ff-823fe69b080e