gluon-ebtables-limit-arp: replace deprecated license identifier

"GPL-2.0+" with its successor "GPL-2.0-or-later"

package/gluon-ebtables-limit-arp/src/Makefile

 # SPDX-FileCopyrightText: 2017 Linus Lüssing <linus.luessing@c0d3.blue>
-# SPDX-License-Identifier: GPL-2.0+
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 all: gluon-arp-limiter
 

package/gluon-ebtables-limit-arp/src/addr_store.c

 // SPDX-FileCopyrightText: 2017 Linus Lüssing <linus.luessing@c0d3.blue>
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <errno.h>
 #include <stdio.h>

package/gluon-ebtables-limit-arp/src/addr_store.h

 // SPDX-FileCopyrightText: 2017 Linus Lüssing <linus.luessing@c0d3.blue>
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 #ifndef _ADDR_STORE_H_
 #define _ADDR_STORE_H_

package/gluon-ebtables-limit-arp/src/gluon-arp-limiter.c

 // SPDX-FileCopyrightText: 2017 Linus Lüssing <linus.luessing@c0d3.blue>
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <arpa/inet.h>
 #include <errno.h>

package/gluon-ebtables-limit-arp/src/gluon-arp-limiter.h

 // SPDX-FileCopyrightText: 2017 Linus Lüssing <linus.luessing@c0d3.blue>
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 #ifndef _GLUON_ARP_LIMITER_H_
 #define _GLUON_ARP_LIMITER_H_

package/gluon-ebtables-limit-arp/src/mac.c

 // SPDX-FileCopyrightText: 2017 Linus Lüssing <linus.luessing@c0d3.blue>
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <linux/if_ether.h>
 #include <stdio.h>

package/gluon-ebtables-limit-arp/src/mac.h

 // SPDX-FileCopyrightText: 2017 Linus Lüssing <linus.luessing@c0d3.blue>
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 #ifndef _MAC_H_
 #define _MAC_H_