merge revision(s) 44572,44578,44591,44592: [Backport #9490]

	ext: use rb_sprintf() and rb_vsprintf() with PRIsVALUE

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44903 b2dd03c8-39d4-4d8f-98ff-823fe69b080e