Revert r42938 "* lib/rubygems: Update to RubyGems 2.1.3"

It breaks build.
http://u64.rubyci.org/~chkbuild/ruby-trunk/log/20130913T200302Z.diff.html.gz

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42941 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 3 deletions

diff --git a/lib/rubygems/platform.rb b/lib/rubygems/platform.rb
index 4a4674b72f..247ee6ed3e 100644
--- a/lib/rubygems/platform.rb
+++ b/lib/rubygems/platform.rb
@@ -2,6 +2,8 @@ require "rubygems/deprecate"
 
 ##
 # Available list of platforms for targeting Gem installations.
+#
+# See `gem help platform` for information on platform matching.
 
 class Gem::Platform
 
@@ -129,12 +131,16 @@ class Gem::Platform
   # Does +other+ match this platform?  Two platforms match if they have the
   # same CPU, or either has a CPU of 'universal', they have the same OS, and
   # they have the same version, or either has no version.
+  #
+  # Additionally, the platform will match if the local CPU is 'arm' and the
+  # other CPU starts with "arm" (for generic ARM family support).
 
   def ===(other)
     return nil unless Gem::Platform === other
 
     # cpu
-    (@cpu == 'universal' or other.cpu == 'universal' or @cpu == other.cpu) and
+    (@cpu == 'universal' or other.cpu == 'universal' or @cpu == other.cpu or
+     (@cpu == 'arm' and other.cpu =~ /\Aarm/)) and
 
     # os
     @os == other.os and
@@ -175,13 +181,13 @@ class Gem::Platform
   end
 
   ##
-  # A pure-ruby gem that may use Gem::Specification#extensions to build
+  # A pure-Ruby gem that may use Gem::Specification#extensions to build
   # binary files.
 
   RUBY = 'ruby'
 
   ##
-  # A platform-specific gem that is built for the packaging ruby's platform.
+  # A platform-specific gem that is built for the packaging Ruby's platform.
   # This will be replaced with Gem::Platform::local.
 
   CURRENT = 'current'