Ruby

• file.c (rb_group_member): renamed from group_member.
  don't use group_member() in glibc because it's not valgrind clean.
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=570047

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@26682 b2dd03c8-39d4-4d8f-98ff-823fe69b080e