Check for llvm-config (without a version suffix)

[smoelius]

Additionally, on Arch Linux the current officially supported LLVM version is 16.0.6 so llvm-config command comes without a version prefix but the build script fails because it invokes llvm-config-16 --version instead of llvm-config --version. I had to create a symbolic link in order to fix this but it would be better if the build script checked llvm-config --version first before invoking the command with a specific prefix.

Originally posted by @a1akris in #434 (comment)