Removed needless extension for require.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63608 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/matrix.rb

@@ -12,7 +12,7 @@
 # Original Documentation:: Gavin Sinclair (sourced from <i>Ruby in a Nutshell</i> (Matsumoto, O'Reilly))
 ##
 
-require "e2mmap.rb"
+require "e2mmap"
 
 module ExceptionForMatrix # :nodoc:
   extend Exception2MessageMapper

lib/thwait.rb

@@ -5,7 +5,7 @@
 #       $Revision: 1.3 $
 #       by Keiju ISHITSUKA(Nihon Rational Software Co.,Ltd.)
 
-require "e2mmap.rb"
+require "e2mmap"
 
 #
 # This class watches for termination of multiple threads.  Basic functionality