Look harder for bsdmake

bsdmake used to be keg-only, so some users still have it unlinked (presumably they never run brew-doctor). Even though there is code to abort if dependencies are unlinked, it appears broken for this case. So let's just be thorough anyway.

Closes Homebrew/homebrew#14751.

Library/ENV/4.3/make

@@ -2,7 +2,10 @@
 export HOMEBREW_CCCFG="O$HOMEBREW_CCCFG"
 if [ $(basename "$0") == "bsdmake" ]; then
   pwd="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-  exec "$pwd/../../../bin/bsdmake" "$@"
+  bsd="$pwd/../../../bin/bsdmake"
+  # bsdmake used to be keg-only: support users who don't run brew doctor
+  [ -x "$bsd" ] || bsd="$(brew --prefix bsdmake)/bin/bsdmake"
+  exec "$bsd" "$@"
 else
   exec xcrun make "$@"
 fi