community/clazy: fix build
fails on builders cos can't find llvm-config
-- Detecting CXX compile features - done
CMake Error at cmake/FindLLVM.cmake:152 (message):
Could not find LLVM: Could NOT find 'llvm-config' executable
Call Stack (most recent call first):
cmake/FindClang.cmake:46 (find_package)
CMakeLists.txt:29 (find_package)
-- Configuring incomplete, errors occurred!
>>> ERROR: clazy: build failed