Make Clang cmake files more usable
* Move Clang*.cmake back to /usr/lib/llvm-X.Y/lib/cmake/clang and install a symlink in /usr/lib/cmake/clang-X.Y to ensure that CMake can still find it. * Ensure that the LLVM installation prefix is correctly discovered despire symlinks (replaces fix-cmake-config-prefix.diff). * Create /usr/lib/llvm-X.Y/bin/clang-6.0 symlink as required by ClangTargets-relwithdebinfo.cmake. * Remove useless LLVM_CMAKE_DIR sed command that did not match anything. * Ignore missing binaries in ClangTargets-relwithdebinfo.cmake. * Add regression test to qualify-clang.sh.
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