Add EnvironmentFile=-/etc/sysconfig/rpcbind to rpcbind.service

Index: rpcbind-0.2.4/systemd/rpcbind.service.in
===================================================================
--- rpcbind-0.2.4.orig/systemd/rpcbind.service.in
+++ rpcbind-0.2.4/systemd/rpcbind.service.in
@@ -11,6 +11,7 @@ After=rpcbind.socket
 [Service]
 Type=notify
 # distro can provide a drop-in adding EnvironmentFile=-/??? if needed.
+EnvironmentFile=-/etc/sysconfig/rpcbind
 ExecStart=@_bindir@/rpcbind $RPCBIND_OPTIONS -w -f
 
 [Install]