zlib: Move to a new zlib package

zlib is a standalone third-party component, and deserves its own
package rather than living in runtime.  For example, this will make
future security updates less invasive.  This also means there's no
dependency on runtime for ports that just require zlib, which is
useful for service jails.

MFC after:	3 days
Reviewed by:	bapt, emaste
Sponsored by:	https://www.patreon.com/bsdivy
Differential Revision:	https://reviews.freebsd.org/D53058

lib/libz/Makefile

@@ -1,7 +1,4 @@
-#
-#
-
-PACKAGE=	runtime
+PACKAGE=	zlib
 LIB=		z
 SHLIBDIR?=	/lib
 SHLIB_MAJOR=	6

release/packages/ucl/zlib-all.ucl

@@ -0,0 +1,32 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2025 Lexi Winter <ivy@FreeBSD.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+comment = "DEFLATE (gzip) data compression library"
+
+desc = <<EOD
+zlib implements the DEFLATE data compression algorithm, as used in the
+GNU gzip(1) utility.  DEFLATE is widely used in many situations, such
+as network protocols (including HTTP) that need to compress data in
+transit, and in utilities that compress data on disk.
+EOD
+
+licenses = [ "Zlib" ]
+
+annotations {
+	set = "minimal,minimal-jail"
+}