* lib/rubygems: Update to RubyGems HEAD(c202db2).

this version contains many enhancements see http://git.io/vtNwF
* test/rubygems: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51092 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/stub_specification.rb

@@ -15,35 +15,32 @@ class Gem::StubSpecification < Gem::BasicSpecification
     end
 
   class StubLine # :nodoc: all
-    attr_reader :parts
+    attr_reader :name, :version, :platform, :require_paths
 
     def initialize(data)
-      @parts = data[PREFIX.length..-1].split(" ")
-    end
-
-    def name
-      @parts[0]
-    end
-
-    def version
-      Gem::Version.new @parts[1]
-    end
-
-    def platform
-      Gem::Platform.new @parts[2]
-    end
-
-    def require_paths
-      @parts[3..-1].join(" ").split("\0")
+      parts          = data[PREFIX.length..-1].split(" ")
+      @name          = parts[0]
+      @version       = Gem::Version.new parts[1]
+      @platform      = Gem::Platform.new parts[2]
+      @require_paths = parts.drop(3).join(" ").split("\0")
     end
   end
 
-  def initialize(filename)
+  def self.default_gemspec_stub filename
+    new filename, true
+  end
+
+  def self.gemspec_stub filename
+    new filename, false
+  end
+
+  def initialize filename, default_gem
     self.loaded_from = filename
     @data            = nil
     @extensions      = nil
     @name            = nil
     @spec            = nil
+    @default_gem     = default_gem
   end
 
   ##
@@ -57,6 +54,10 @@ class Gem::StubSpecification < Gem::BasicSpecification
     end
   end
 
+  def default_gem?
+    @default_gem
+  end
+
   def build_extensions # :nodoc:
     return if default_gem?
     return if extensions.empty?
@@ -135,14 +136,14 @@ class Gem::StubSpecification < Gem::BasicSpecification
   # Name of the gem
 
   def name
-    @name ||= data.name
+    data.name
   end
 
   ##
   # Platform of the gem
 
   def platform
-    @platform ||= data.platform
+    data.platform
   end
 
   ##