base-files: do not create broken var/spool/mail/mail symlink.

And remove it if it was created by previous versions.

srcpkgs/base-files/INSTALL

@@ -64,7 +64,11 @@ make_system_dirs() {
 	cd var
 	ln -sf ../run .
 	ln -sf ../run/lock .
-	ln -sf spool/mail mail
+	ln -sfn spool/mail mail
+	if [ -L spool/mail/mail -a "$(readlink spool/mail/mail)" = spool/mail ]; then
+		# Get rid of broken symlink created by older versions of base-files.
+		rm spool/mail/mail
+	fi
 	cd ..
 
 	install -dm1777 tmp

srcpkgs/base-files/template

@@ -1,7 +1,7 @@
 # Template file for 'base-files'
 pkgname=base-files
 version=0.139
-revision=2
+revision=3
 bootstrap=yes
 depends="xbps-triggers"
 short_desc="Void Linux base system files"