[SRU] Update gnome-shell to 3.4.2

[Alusa]

[IMPACT]
GNOME bug fix update

https://mail.gnome.org/archives/ftp-release-list/2012-July/msg00101.html

Please consider approving the update to 3.4.2 for gnome-shell, upstream changelog below:

* Mirror Evolution calendar settings into our own schema [Owen; #674424]
* gdm: don't fail if fprintd unavailable [Ray; #675006]
* Fix broken extension loading [Owen, Alexandre; #670477]
* Fix filtering of Empathy notifications [Guillaume; #675370]
* telepathyClient: Ignore invalidated channels [Guillaume; #677457]
* popupMenu: Fix freeze when appMenu is not populated in one go [Alban; #676447]
* mount-operation: fix exceptions when showing password entry [Cosimo; #678428]
* Misc. fixes [Guillaume, Jasper, Rico; #677441, #676175]

[TESTCASE]
* This is covered by the GNOME MRE. No explicit test case required, only aging for regression testing.

[Regression Potential]

 * This is shipped by default in the Ubuntu 12.04 GNOME Shell Remix

[Scott Kitterman (kitterman)]

verification tags are for after something has been uploaded.

[Alusa (alusa)]

Why doesn't anyone care about this? In Ubuntu 11.10 and 12.10 the latest gnome-shell point release was uploaded.

[Steve Langasek (vorlon)]

The Precise Pangolin has reached end of life, so this bug will not be fixed for that release