emacs cask: install to site-lisp

Closes #28033.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
libvirt 1.2.3
libvirt: update 1.2.3 bottle.

Closes #28034.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
giflib: add 4.1.6 bottle.