Ruby

Makefile.in: fix portability issue

• Makefile.in (mjit_config.h): Alternative value with $@ and
  printf without argument are not portable, could fail on some
  platforms.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62585 b2dd03c8-39d4-4d8f-98ff-823fe69b080e