merges r21893 from trunk into ruby_1_9_1. * tool/make-snapshot (prereq): remove enc.mk from tarball because BSD make checks $(srcdir)/enc.mk and try to run $(builddir)/enc.mk.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21895 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r21893 from trunk into ruby_1_9_1.
* tool/make-snapshot (prereq): remove enc.mk from tarball because
BSD make checks $(srcdir)/enc.mk and try to run $(builddir)/enc.mk.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21895 b2dd03c8-39d4-4d8f-98ff-823fe69b080e