[Driver] Move GCC multilib/multiarch paths support from Linux.cpp to Gnu.cpp
The current code for GNU/Linux is actually completely generic, and can be moved to ToolChains/Gnu.cpp, so that it can benefit GNU/Hurd and GNU/kFreeBSD. Reviewed By: MaskRay, phosek Differential Revision: https://reviews.llvm.org/D73845
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