release: fix on-disc pkg binary symbolic links

Note: As this change was tested during the 13.1 cycle, but never
merged back to stable/12, this change does not warrant an RC3.

Approved by:	re (cperciva)
PR:		263574
Sponsored by:	Rubicon Communications, LLC ("Netgate")

(cherry picked from commit 68b0a79)
(cherry picked from commit f398c2d)

release/scripts/pkg-stage.sh

@@ -86,7 +86,9 @@ ${PKGCMD} fetch -o ${PKG_REPODIR} -d ${DVD_PACKAGES}
 # using the on-disc packages.
 mkdir -p ${PKG_REPODIR}/Latest
 (cd ${PKG_REPODIR}/Latest && \
-	ln -s ../All/$(${PKGCMD} rquery %n-%v pkg).txz pkg.txz)
+	ln -s ../All/$(${PKGCMD} rquery %n-%v pkg).pkg pkg.pkg)
+(cd ${PKG_REPODIR}/Latest && \
+	rm -f pkg.txz && ln -s pkg.pkg pkg.txz)
 
 ${PKGCMD} repo ${PKG_REPODIR}