Context:

Currently the CMake build for 'test/fuzz' assumes that it if can correctly source the LLVM CMake Package, the clang fuzzer library is available under the systems library path (i.e. can link with '-fsanitize=fuzzer').

This is incorrect/buggy behaviour. In some cases, CMake could source a LLVM Package, where the fuzzer library install is not under any default library system path. This hence leads to a compiler error, where the '-fsanitize=fuzzer' linker flag fails compilation (due to not being able to find libFuzzer).

Definition of Done:

There are two main approaches we could take. These either being:

1. Correctly source the absolute location of the libFuzzer library and explicitly link the library file to the fuzzer test executable. We can source the full libFuzzer library path with 'llvm_map_components_to_libnames' (available under the CMake LLVM package). If the path cannot be sourced, skip compilation of the fuzzer.
2. Test compile if the '-fsanitize=fuzzer' linker flag is available on the user's system. If not, skip compilation of the fuzzer.

I'd strongly prefer we go with Option 1 and try to make that work (Option 2 limits the ability to compile test/fuzz  to specific system environment configurations)