unposted: Fix util-linux variant detection in _getopt

This had been broken all along for the actual util-linux getopt; i think the
'enhanced' text comes from the original author's version, which Homebrew was
still using when the function was written

ChangeLog

@@ -1,5 +1,8 @@
 2022-04-26  dana  <dana@dana.is>
 
+	* unposted: Completion/Unix/Command/_getopt: Fix util-linux
+	variant detection
+
 	* unposted: NEWS: Adjust dedication wording
 
 2022-04-26  Jun-ichi Takimoto  <takimoto-j@kba.biglobe.ne.jp>

Completion/Unix/Command/_getopt

@@ -2,9 +2,10 @@
 
 local -a args aopts
 
-# Note: BusyBox getopt is borrowed straight from util-linux, so they're
-# basically identical
-if _pick_variant busybox=BusyBox util-linux='getopt*enhanced' unix --version; then
+# @todo BusyBox getopt is borrowed straight from util-linux, so they're nearly
+# identical, but not quite: BusyBox doesn't have -h and -V and often doesn't
+# support long options. So possibly this could be more accurate
+if _pick_variant busybox=BusyBox util-linux='(enhanced|util-linux)' unix --version; then
   args=(
     '(-a --alternative)'{-a,--alternative}'[allow long options with single -]'
     '(: -)'{-h,--help}'[display help information]'