Squashed 'qtimageformats/' changes from f293cc8..37257d4

37257d4 Doc: Made "Qt Image Formats" entry in Assistant/Creator childless.
aa3c1a3 sync.profile: Point dependencies to an empty string
65f8998 Add changes-5.1.0 file
0b619ad test: Remove insignificant_test from tst_qtiff
eec8ed4 TGA-Reader: Bail out of check if the device is not seekable.

git-subtree-dir: qtimageformats
git-subtree-split: 37257d4be0cab8d5a92db9566f89ac115645f81f
[update] update to upstream commit 2e0e26d
Merge commit 'ef8b7f9f3772599c56ce5c33b3c0b731f2329a13'
[packaging] touch .git to make sure that syncqt is run

Signed-off-by: Carsten Munk <carsten.munk@jollamobile.com>