Enable webkitwidgets module depending on the Qt version used

Open-webOS-DCO-1.0-Signed-off-by: Mikko Levonmaa <mikko.levonmaa@palm.com>

Change-Id: Ib07c22cfb0eacf353bb3731a438bb5cc3e1aa407
Remove unneeded sound modules and cleanup the .pro file

The sound modules weren't used in webappmanager, so can be removed,
plus the references to them in the .pro file.
Also removed references to unused #defines in the .pro file.

When built with Qt5, now includes QtWebkitWidget in the pri files.

Removed reference to serviceinstaller from the device.pri file

Open-webOS-DCO-1.0-Signed-off-by: Roger Stringer <roger.stringer@palm.com>

Change-Id: I2e43da62427722e2953266e56329d1042e439886
Use pkg config to find sysmgr-ipc headers

Open-webOS-DCO-1.0-Signed-off-by: Mikko Levonmaa <mikko.levonmaa@palm.com>

Change-Id: I26e0c15dfe39d59dd81838a96c732ba04fea94a3
Update build instructions in README file

Open-webOS-DCO-1.0-Signed-off-by: Roger Stringer <roger.stringer@palm.com>

Change-Id: Ie0158877c90097c7f14e589ae7d59b38056cd342
Use xcb QPA for desktop (fixes no fonts issue)

Open-webOS-DCO-1.0-Signed-off-by: Eric Blade <eric.blade@palm.com>

Change-Id: Ic36c821a8b32c2501c6b344226388e2183eb9540