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[Driver] Bring back "Clean up Debian multiarch /usr/include/<triplet> madness"

Authored by MaskRay on Wed, Mar 24, 3:25 PM.

Description

[Driver] Bring back "Clean up Debian multiarch /usr/include/<triplet> madness"

This reverts commit aae84b8e3939e815bbc1e64b3b30c0f10b055be4.

The chromium goma folks want to use a Debian sysroot without
lib/x86_64-linux-gnu to perform clang -c but no link action. The previous
commit has removed D.getVFS().exists check to make such usage work.