[sr-dev] git:4.1: modules/sdpops: added sdp_with_transport_like() function

[Juha Heinanen]

> modules/sdpops: added sdp_with_transport_like() function

while doing it, i noticed that several modules use memmem or ser_memmem
function.  memmem is built in, but requires

#define _GNU_SOURCE

it is used by auth_identity module. nathelper, rtpengine, and rttproxy
modules (and now also sdpops) as well as parser use ser_memmem and each
defines it separately.

what is the preferred way to straighten out this mess?  can we assume
that kamailio code is non-portable and thus defining _GNU_SOURCE is
acceptable.  if not, what is the best place to put ser_memmem so that
it is defined only once?

-- juha