[PATCH] Teach zorg to support cmake and modules for Clang builders

[Richard Smith]

Conditionalize adding of `-fmodules` etc on the `modules` flag, and don't change existing two-stage buildbots' behavior with respect to cleaning stage 2 before rebuilding it.

http://reviews.llvm.org/D4936

Files:
  zorg/buildbot/builders/ClangBuilder.py
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