[EFL] Build fix
https://bugs.webkit.org/show_bug.cgi?id=109518

Patch by Jae Hyun Park <jae.park@company100.net> on 2013-02-11
Reviewed by Laszlo Gombos.

Fix EFL build by including PluginProcessConnectionManager.messages.in in
CMakeLists.txt

* CMakeLists.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142562 268f45cc-cd09-0410-ab3c-d52691b4dbfc