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libmakepkg: fix compatibility with bash-5.2 patsub_replacement

Allan McRae requested to merge allan/bash-5.2 into master

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

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