Fix compilation under LLVM/clang with --enable-gcc-warnings When compiling using clang (2.9 or lower) do not enable -Wnormalized=id or -Woverride-init when --enable-gcc-warnings or --enable-gcc-warnings-advisory is set as these options are unsupported. This commit is based on a patch for Tor (git commit 56bdc844ba68ac0911efc7ad3398f1eafeaaac76 by Steven Murdoch), Copyright (c) 2007-2011, The Tor Project, Inc.