qt5: bump version to 5.6.1-1

qt5: bump version to 5.6.1-1

Removed obsolete patches:

  - qt5base/0001-Disable-c-standard-compiler-flags-for-the-host-build.patch (upstream committed [1])
  - qt5/qt5base/0007-build-with-explicitlib-after-all.patch (upstream committed [2])
  - qt5tools/0001-Disable-qdoc-needs-qtdeclarative.patch (fixed upstream by [3])
  - qt5webkit/0004-Fix-linking-with-libpthread.patch (upstream committed [4])

[1] http://code.qt.io/cgit/qt/qtbase.git/commit/?id=e69e69519661954716d59bfa5bbd0626515cfda9
[2] http://code.qt.io/cgit/qt/qtbase.git/commit/?id=523c7e3fd55c853dd424d57f28e225d57439cf89
[3] http://code.qt.io/cgit/qt/qttools.git/commit/?id=2b262fad86ef38a5fa692b4c73e6ec26a5d45a5f
[4] http://code.qt.io/cgit/qt/qtwebkit.git/commit/?id=5f359baacdf92fabcece83f0a2b30f74c7c02a3c

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>