D17858: clang: Also detect Clang builtin dirs at runtime on Unix

[René J.V. Bertin]

rjvbb set the repository for this revision to R32 KDevelop.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D17858

To: rjvbb, #kdevelop, flherne, mwolff
Cc: arrowd, mwolff, flherne, kdevelop-devel, glebaccon, hase, antismap, iodelay, geetamc, Pilzschaf, akshaydeo, surgenight
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