Fix permissions on /tmp when installing the runtime package.

Reported by:	many
Patch by:	Kyle Evans
PR:		217574
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

release/packages/runtime.ucl

@@ -20,6 +20,7 @@ scripts: {
 	post-install = <<EOD
 	cap_mkdb %CAP_MKDB_ENDIAN% ${PKG_ROOTDIR}/etc/login.conf
 	pwd_mkdb %PWD_MKDB_ENDIAN% -i -p -d  ${PKG_ROOTDIR}/etc ${PKG_ROOTDIR}/etc/master.passwd
+	chmod 1777 ${PKG_ROOTDIR}/tmp
 EOD
 }
 deps: {