qtbase: upgrade to 5.2.0-beta1

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
qtmodules: bump SRCREVs for 5.2.0-beta1 tags

* qt5-git: Bump PV
  now all modules using qt5-git should be newer than any 5.1.* version
  and older than 5.2.0 (that's why 5.1.99+5.2.0-beta1+git is used

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
qtwebkit: Explicitly add ICU libraries to LIBS

* fails to build without this

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>