pkgbase: do not record dependency on non-existent liby package

liby-dev provides (only) liby.a.  liby has no headers or man pages, and
there is no liby package.  Add a special case to record no dependency on
the package that does not exist.

PR:		266923
Reviewed by:	bapt
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D37429

release/packages/generate-ucl.sh

@@ -45,6 +45,18 @@ main() {
 		caroot)
 			pkgdeps="openssl"
 			;;
+
+		# -dev packages that have no corresponding non-dev package
+		# as a dependency.
+		liby-dev)
+			outname=${outname%%-dev}
+			_descr="Development Files"
+			;;
+		liby-lib32_dev)
+			outname=${outname%%-lib32_dev}
+			_descr="32-bit Libraries, Development Files"
+			;;
+
 		utilities)
 			uclfile="${uclfile}"
 			;;