Bash-5.2 introduced the patsub_replacement shell option, which is enabled
by default. Apparently is it supposed to handle a sed-like idiom, but
what it does achieve is making any substitution involving a "&" requiring
special care.
For makepkg's DLAGENTS, we replace "%o" and "%u" if present. Any "&" in
the replacement fields triggers patsub_replacement unless quoted. This is
particularly important for the URL field.
Add relevant quotes to avoid issues.
Signed-off-by: Allan McRae <allan@archlinux.org>