Let llvm-config report libc++

[Jeroen Ketema]

If llvm-config reports '-stdlib=libc++' with --cxxflags it should also report it with '--ldfags', as compiling with '-stdlib=libc++' requires that we should also link with '-stdlib=libc++'. Patch that achieves this for the configure-style Makefiles attached (an option similar to --enable-libcpp does not seem to be supported by cake).

Regards,

 Jeroen Ketema
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