gmake.mk: get rid of unicode normalization table timestamp
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67438 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
gmake.mk: get rid of unicode normalization table timestamp
timestamp. update the target tables file only when only it
exists.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67438 b2dd03c8-39d4-4d8f-98ff-823fe69b080e