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clang now uses c++11, which on OS X means it depends on libc++.
OS X 10.6 doesn't have libc++ yet, but some bots still are on 10.6 and
upgrading them will take a bit longer. Bundle libc++ with the clang package,
and set rpaths so that both clang and plugins refer to the bundled libc++
instead of /usr/lib/libc++.1.dylib.

(System libraries will still cause libstdc++ to be loaded as well. Since libc++
keeps its symbols in std::__1:: and aliases everything to that, loading libc++
and libstdc++ in the same process is safe.)

Also don't set MACOSX_DEPLOYMENT_TARGET while building the bootstrap
compiler (Xcode's clang complains when using -stdlib=libc++ when targeting
10.6 or older; open-source luckily doesn't for some reason).

Also pass -isysroot; when building on OS X 10.9, /usr/include doesn't exist
unless the command line tools are installed.

BUG=358500
TEST=Run package.sh (with a tweaked clang revision, to not clobber an
existing package). Upload produced tgz file somewhere, download it on
a 10.6 box. Clang should run.

R=hans@chromium.org

Review URL: https://codereview.chromium.org/218613009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260908 0039d316-1c4b-4281-b951-d872f2087c98