formula_auditor: fix false positive in `audit_gcc_dependency`.
formula_auditor: fix false positive in `audit_gcc_dependency`.

Fixes Homebrew/homebrew-core#110178.

MikeMcQuaid/brew,Homebrew/brew,JCount/brew,MikeMcQuaid/brew,nandub/brew,JCount/brew,Homebrew/brew,nandub/brew,JCount/brew,Homebrew/brew,MikeMcQuaid/brew,JCount/brew,nandub/brew,Homebrew/brew,MikeMcQuaid/brew,nandub/brew