Bogus PATHS in find_package in the JIT plug-in

[yurivict]

This line has a bogus PATHS ${LLVM_DIR}/../Clang argument:

find_package(Clang PATHS ${LLVM_DIR}/../Clang)

The llvm19, llvm17, llvm15 packages on FreeBSD don't install the "Clang" directory.
The "Clang" directory is assumed to be present along with llvm which isn't where clang is normally installed.

The correct way to find Clang is to add CMAKE_MODULE_PATH=${LLVM_PREFIX}/lib/cmake/clang.

Same problem is with the Polly package here.

Version: 3.4.1