D15998: Fix discovery of clang builtin directory with clang svn versions

[Kevin Funk]

kfunk accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D15998

To: buschinski, #kdevelop, kfunk
Cc: kdevelop-devel, glebaccon, antismap, iodelay, vbspam, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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