Log Message:
mate-media: amend patch-configure (NFC)

While preparing to send patch-configure upstream, I noticed there were
more issues present. None would affect how the package builds as we've
defined it, but I'm aligning this patch with what I've sent upstream,
for consistency. (pkgsrc's check-portability.awk doesn't catch
incorrect expressions of test[1] if they're [unnecessarily] enclosed
in parentheses, so some of this didn't get automatically flagged when I
originally updated the package.)