package/freeswitch: bump version to 1.6.8

Removed patches applied upstream:
https://freeswitch.org/stash/projects/FS/repos/freeswitch/commits/eadb3f890f6e7ba3b3ca23c6feb144fb35d304ce
https://freeswitch.org/stash/projects/FS/repos/freeswitch/commits/b024c752fb2e9789fdbaf769be9998f62bb5c483



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