xmlrpc: Add SPDX identifiers

src/modules/xmlrpc/http.c

@@ -4,6 +4,8 @@
  *
  * This file is part of Kamailio, a free SIP server.
  *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
  * Kamailio is free software; you can redistribute it and/or modify it under the
  * terms of the GNU General Public License as published by the Free Software
  * Foundation; either version 2 of the License, or (at your option) any later

src/modules/xmlrpc/http.h

@@ -4,6 +4,8 @@
  *
  * This file is part of Kamailio, a free SIP server.
  *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
  * Kamailio is free software; you can redistribute it and/or modify it under the
  * terms of the GNU General Public License as published by the Free Software
  * Foundation; either version 2 of the License, or (at your option) any later

src/modules/xmlrpc/xmlrpc.c

@@ -4,6 +4,8 @@
  *
  * This file is part of Kamailio, a free SIP server.
  *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
  * Kamailio is free software; you can redistribute it and/or modify it under the
  * terms of the GNU General Public License as published by the Free Software
  * Foundation; either version 2 of the License, or (at your option) any later

src/modules/xmlrpc/xmlrpc.h

@@ -4,6 +4,8 @@
  *
  * This file is part of Kamailio, a free SIP server.
  *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
  * Kamailio is free software; you can redistribute it and/or modify it under the
  * terms of the GNU General Public License as published by the Free Software
  * Foundation; either version 2 of the License, or (at your option) any later