glib-2.0: Add .bbappend with fix for multicast

:Release Notes:
- Add .bbappend
- Add fix-joiningleaving-multicast-groups.patch

:Detailed Notes:
gsocket: fix joining/leaving multicast groups
Initialize the structure passed to setsockopt to 0 to avoid random
errors when joining or leaving a multicast group.

:Testing Performed:
Ran joining/leaving tests with multicast addr.

:QA Notes:

:Build Note:
requires multilayer build with https://gpro.palm.com/24159
    https://gpro.palm.com/24205 https://gpro.palm.com/24221
    https://gpro.palm.com/24207

:Issues Addressed:
[GF-56890] Implement SKB LIVE Client
[GF-57241] CCC: glib-2.0(Add .bbappend with fix for multicast) ...

Open-webOS-DCO-1.0-Signed-off-by: Junsoo Park <junsoo81.park@lge.com>
Change-Id: Ia6a9c8f0224d0966fd2a3bbfefd08dd575c23775
Reviewed-on: https://g2g.palm.com/4294
Reviewed-by: DCO Verification
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Sanghoon Cha <sanghoon.cha@lge.com>
Reviewed-by: Joungyong Choi <joungyong.choi@lge.com>
Tested-by: Joungyong Choi <joungyong.choi@lge.com>