fixed call to markgc

git-svn-id: http://svn.macosforge.org/repository/ruby/MacRuby/trunk@243 23306eb0-4c56-4727-a40e-e92c0eb68959

instruby.rb

@@ -497,7 +497,7 @@ def install_stuff(what, from, to, mode)
   end
 end
 Dir.glob('/System/Library/Frameworks/**/BridgeSupport/*.dylib').each do |p|
-  unless system("markgc '#{p}' >& /dev/null")
+  unless system("./markgc '#{p}' >& /dev/null")
     $stderr.puts "cannot markgc #{p}"
     exit 1
   end