Build system does not support Clang 19 reliably

[Jamlee]

serenity/Meta/find_compiler.sh

Line 59 in 61f6c6c

find_newest_compiler clang clang-17 clang-18 /opt/homebrew/opt/llvm/bin/clang

[Hendiadyoin1]

When you have your clang 19 aliased as your normal clang it should still be picked up,
Otherwise this should be a simple fix, maybe even going as far as jinxing it to do a clang-\d+ check

[nico]

@ady-31 Please don't spam this repo with copy-pasted AI output.