Added option to compile PJSIP with verbose output

Ignore-this: 3b950727cf08579310ca7fdb636baa06

darcs-hash:20130716093019-56b4d-82f894aa517ccf50e86599877f0976fdfb2b1351
pjsip: Fixed resetting AEC state

Ignore-this: 775e6906e66ddda91e791c933cece44a

darcs-hash:20130716145308-56b4d-75a0f720f476c6a1b1d9449bb3ba1bb259e89abf
pjsip: Fixed some log lines in AEC

Ignore-this: 9c59b0d8605d3b912de67ab6006b556d

darcs-hash:20130716145626-56b4d-315c7b13b0e0b3d4758e59f20367f65f81470983