generic_erb.rb: get rid of fileutils

* tool/generic_erb.rb: get rid of FileUtils.touch, not to depend
  on fileutils.rb which will depend on rbconfig.rb which does not
  exist when creating encdb.h.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63432 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/generic_erb.rb

@@ -5,7 +5,6 @@
 
 require 'erb'
 require 'optparse'
-require 'fileutils'
 $:.unshift(File.dirname(__FILE__))
 require 'vpath'
 require 'colorize'
@@ -55,7 +54,8 @@ if output
       dir, base = File.split(output)
       timestamp = File.join(dir, ".time." + base)
     end
-    FileUtils.touch(timestamp)
+    File.open(timestamp, 'a') {}
+    File.utime(nil, nil, timestamp)
   end
 else
   print result