test_unicode_normalize.rb: skip if not found

* test/test_unicode_normalize.rb (read_tests): do nothing if the
  test data file is not found.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48387 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_unicode_normalize.rb: skip only once

* test/test_unicode_normalize.rb (setup): skip only once, and
  silently ignore other tests.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48388 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* lib/rubygems/*: Update to RubyGems 2.4.3 master (7b1f684).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48389 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* gems/bundled_gems: Update to test-unit 3.0.6 and minitest 5.4.3.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48390 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
gc.c (struct heap_page): trivial packing

304 => 296 bytes on x86-64

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48391 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-11-13

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48392 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Remove obsolete prot_tag comment

The changelog records Matz mentioning that this was obsolete as of:
    Wed Sep 17 23:41:45 2003