[configure] Make the push-forwarder plugin configurable

Signed-off-by: Martti Piirainen <martti.piirainen@oss.tieto.com>
Merge pull request #183 from marttipiirainen/next

Make the push-forwarder plugin configurable
Merge branch 'next' of github.com:nemomobile-packages/ofono into next
[configure] Make libwspcodec dependency conditional

Signed-off-by: Martti Piirainen <martti.piirainen@oss.tieto.com>
Merge pull request #182 from jkangas/next

Request for pulling tech pref config possibility based on mobile country code to next branch
Merge pull request #185 from marttipiirainen/next

Make libwspcodec dependency conditional
Merge branch 'next' of github.com:nemomobile-packages/ofono into next
[sim] Unpack the 7 bit PNN before converting to utf8

Without conversion convert_gsm_to_utf8 returns wrong
value.

Signed-off-by: Jussi Kangas <jussi.kangas@oss.tieto.com>