Escalate missing doxygen to a fatal error when running the pre-commit suite on *nix to ensure we get some docs testing.  Decided not to do so on Windows as our bots do not have doxygen.  This remains a warning for individual builds.
Escalate missing doxygen to a fatal error when running the pre-commit suite
on *nix to ensure we get some docs testing.  Decided not to do so on
Windows as our bots do not have doxygen.  This remains a warning for
individual builds.

SVN-Revision: 1953

sigma-random/drmemory,LohithBlaze/drmemory,code4bones/drmemory,sigma-random/drmemory,LohithBlaze/drmemory,code4bones/drmemory,sigma-random/drmemory,sigma-random/drmemory,code4bones/drmemory,LohithBlaze/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,LohithBlaze/drmemory,code4bones/drmemory,code4bones/drmemory