cl: prepare for compileTemplateClass - #870

libffi is keg-only and must be linked with `--force`.

`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!

Already linked: /opt/homebrew/Cellar/lld@22/22.1.8

llvm@22 was installed but not linked because llvm@20 is already installed. To link this version, run: brew link llvm@22

`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!