fontconfig: fix scanning subdirectories

Fixes #28111.
fontconfig: update 2.11.1 bottle.

Closes #28151.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
Xcode.prefix: remove osx-gcc-installer hack

This hack is starting to outlive its usefulness, and produces false
positives.

Fixes #28147.