package/sofia-sip: bump version to 1.13.1

package/sofia-sip: bump version to 1.13.1

Rebased patch 0001.

Added patch 0002 previously used for the sofia-sip library which was
bundled with the freeswitch source:
https://git.buildroot.net/buildroot/commit/package/freeswitch?id=3c2e8b2b29a88c35c8a9867537d3ce3d0af85bc2
The bundled library was removed in freeswitch-1.10.4.

Switched upstream to freeswitch repo according to
http://sofia-sip.sourceforge.net/

"This repository is not currently maintained.

 The FreeSWITCH project hosts a currently maintained version of this
 library at https://github.com/freeswitch/sofia-sip"

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>