make-snapshot: remove Unicode data

* make-snapshot: remove Unicode data files, which are not
  necessary once all source have been generated.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53589 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/make-snapshot

@@ -257,6 +257,7 @@ def package(vcs, rev, destdir, tmp = nil)
       puts " done"
     end
     clean.add("autom4te.cache")
+    clean.add("enc/unicode/data")
     print "creating prerequisites..."
     if File.file?("common.mk") && /^prereq/ =~ commonmk = IO.read("common.mk")
       puts