update to cctools-855 and ld64-236.3, import changes from https://github.com/tpoechtrager/cctools-port


git-svn-id: http://ios-toolchain-based-on-clang-for-linux.googlecode.com/svn/trunk@424 192d390f-68cd-2e80-0b0a-9fecc8863338
clean unused folder


git-svn-id: http://ios-toolchain-based-on-clang-for-linux.googlecode.com/svn/trunk@425 192d390f-68cd-2e80-0b0a-9fecc8863338
changes


git-svn-id: http://ios-toolchain-based-on-clang-for-linux.googlecode.com/svn/trunk@428 192d390f-68cd-2e80-0b0a-9fecc8863338