Use pjsip 2.10 by default

Author: adigeo

deps/patches/2.11/001_pjsip_210.patch

@@ -2,7 +2,7 @@ diff -ruN pjproject-2.10/base_rev pjsip/base_rev
 --- pjproject-2.10/base_rev	1970-01-01 01:00:00.000000000 +0100
 +++ pjsip/base_rev	2021-02-07 00:21:58.163902742 +0100
 @@ -0,0 +1 @@
-+211
++210
 diff -ruN pjproject-2.10/pjlib/src/pj/os_core_unix.c pjsip/pjlib/src/pj/os_core_unix.c
 --- pjproject-2.10/pjlib/src/pj/os_core_unix.c	2020-02-14 10:48:27.000000000 +0100
 +++ pjsip/pjlib/src/pj/os_core_unix.c	2021-02-06 23:59:38.145916811 +0100