databases/mysql57-server: Fix rc-script ${name}_limits conflict for post-r328331 base

This is port of r461217

databases/mysql80-server/Makefile

@@ -3,6 +3,7 @@
 
 PORTNAME?=		mysql
 PORTVERSION=		8.0.2
+PORTREVISION?=		1
 DISTVERSIONSUFFIX?=	-dmr
 CATEGORIES=		databases ipv6
 MASTER_SITES=		MYSQL/MySQL-8.0

databases/mysql80-server/files/mysql-server.in

@@ -47,6 +47,9 @@ fi
 if [ ! -z "${mysql_optfile}" ]; then
 mysql_extra="--defaults-extra-file=${mysql_optfile}"
 fi
+if [ "${mysql_limits}" = "NO" ]; then
+mysql_limits=""
+fi
 
 mysql_user="mysql"
 mysql_limits_args="-e -U ${mysql_user}"
@@ -70,7 +73,7 @@ mysql_prestart()
 	if [ ! -d "${mysql_dbdir}/mysql/." ]; then
 		mysql_create_auth_tables || return 1
 	fi
-	if checkyesno mysql_limits; then
+	if [ -z "$mysql_limits" ] || checkyesno mysql_limits; then
 		eval `/usr/bin/limits ${mysql_limits_args}` 2>/dev/null
 	else
 		return 0