OpenDHT 1.6.0 unifies its API so users don't need to use
extra build flags.

Change-Id: Iea965def553a1a059cc9c41d3ff15ab96b2a8f31

remove inexistant variable

Change-Id: I86db7aedb7151b508b4d52ad6bc8224d7386810a
Reviewed-by: Maxim Cournoyer <maxim.cournoyer@savoirfairelinux.com>

* Bump restbed for OpenDHT, update patch and add patch to react
  to timeout and socket closed in restbed.
* Bump OpenDHT to support push notifications
* Add DRing APIs to support setting a client push notification token
  and to retransmit push notifications to dring
* Implement proxy support in RingAccount

Change-Id: I8d3a02cf54a9666a94ab992ee3fa2958e82aa7ad

Move build requirements from C++11 to C++14, for contrib and core.

[GR: ci msg + contrib support + m4 update]

Change-Id: I22793ba1ca06ea7c45d237c882a92d20a008f76f
Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
Signed-off-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>

Change-Id: Ia972ca8b3ae99f382ca7d7433071e4c3dd07a6ee
Tuleap: #682

This adds compiler support for C++14 and C++17.
C++11 has a better detection.

Change-Id: Ib65c399ac7755c7e5ed409c96b4fd7cac4d3d5e0
Tuleap: #438

Refs #68986

Change-Id: Ia95b140e4f4d6625d1df12d52a40414482b2e773

Modify Fedora Core spec to support fedora core 6 (libsamplerate, libeXosip2)

- Key_Mode_switch isn't part of QT 3.3 (official)
- qt program are better with full path (moc, uic, qembed)

Makefile.am and m4 updates for warnings and paths, README updates.

Remove libexosip2
Add --disable-sflphoneqt to compile without X

Use PORTAUDIO_LIBS variable to compile libportaudio.la with -lflags (-lasound)