[PATCH cygport] Use correct wording if only one package is announced

[Brian Inglis]

On 2024-02-21 07:25, Christian Franke via Cygwin-apps wrote:

Change variable name from $s to $has or $s_have as variable $s usually implies 
only the plural letter s or nothing; e.g.
...
+	local has="s have"
+
+	[ $pkg_count != 1 ] || has=" has"
...
+The following package${has} been uploaded to the Cygwin distribution:
...
-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry