Strip extraneous spaces from included filename

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5770 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rdoc/markup/simple_markup/preprocess.rb

@@ -20,13 +20,15 @@ module SM
     def handle(text)
       text.gsub!(/^([ \t#]*):(\w+):\s*(.+)?\n/) do 
 
+        prefix    = $1
         directive = $2.downcase
         param     = $3
 
         case directive
 
         when "include"
-          include_file($3, $1)
+          filename = param.split[0]
+          include_file(filename, prefix)
 
         else
           yield(directive, param)