qt5: upgrade to 5.2.0

* drop 0027-Fix-misaligned-selection-region-with-text-when-cente.patch
  resolved in upstream commit 5d8a882c11201a29475c5ea71cfb76c9de6573f5
* drop 0020-Use-BGRA-extension-in-bindTexture.patch
  resolved in upstream commit e1325cf26e146b68725cc1a0a02b274ce3dfbe5c
* drop 0008-wayland-scanner-disable-silent-rules.patch
  resolved upstream in:
  commit 2ff2a7c32d76b9e58b800f12469f112cfdb6ad3c
  Author: Jan Arne Petersen <jan.petersen@kdab.com>
  Date:   Fri Jul 19 14:35:19 2013 +0200
  Fix wayland-scanner to work with CONFIG+=silent

* squash to match more with structure of
  https://github.com/meta-qt5/qtbase/tree/stable

* qtmodules: bump SRCREVs for 5.2.0 tags
  now all modules using qt5-git should be newer than any 5.1.* version
* qtbase: fix paths in packageconfig *.pc files
  include- and lib-paths contained build-sysroot paths
* qtwebkit: Explicitly add ICU libraries to LIBS
  fails to build without this
* qtjsbackend: remove for git versions
  Found in [1]:
  Qt Qml is now using its own built-in Javascript engine and does not depend on
  V8 anymore. As such the QtJSBackend shared library has disappeared.
  [1] http://blog.qt.digia.com/blog/2013/09/30/qt-5-2-alpha-available/
* qt5: Upgrade 5.1.1 recipes to 5.2.0 to match git recipes
  qtjsbackend is now completely gone
  it allows to share more .patch files and configuration in .inc again

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
qtbase: remove gstreamer packageconfig

Nothing in qtbase uses gstreamer so the configure option was removed on the way
to 5.2 [1]. Fixes:

| -no-gstreamer: invalid command-line switch

[1] https://qt.gitorious.org/qt/qtbase/commit/e25a4faf4a33a758a51c1b96dfdead2f1675ccd7

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
qt5: Fix cmake config files

* without syncqt cmake config files have empty PRIVATE_INCLUDE_DIRS
  remove pregenerated header files and create .git dir to let qmake
  call syncqt and generate headers like when building from git recipes

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