Add changes file for Qt 5.9.2

Change-Id: I87e8292ee606af33f729e2b492a616325a49c89a
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

dist/changes-5.9.2

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+Qt 5.9.2 is a bug-fix release. It maintains both forward and backward
+compatibility (source and binary) with Qt 5.9.0.
+
+For more details, refer to the online documentation included in this
+distribution. The documentation is also available online:
+
+http://doc.qt.io/qt-5/index.html
+
+The Qt version 5.9 series is binary compatible with the 5.8.x series.
+Applications compiled for 5.8 will continue to run with 5.9.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+https://bugreports.qt.io/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                               Qt 5.9.2 Changes                           *
+****************************************************************************
+
+- Don't crash when removing clip animators
+- Case-insensitive matching of DDS/PKM files [QTBUG-61760]
+- Fix crash when using a single key frame
+- Fix rendering glitches with 2D text
+- Respect render target selector when reading pixel data back [QTBUG-61547]
+- Fix memory leaks when loading multiple scenes with assimp [QTBUG-61856]
+- Fix updates of some render states
+- Fix sorting of render commands [QTBUG-60183]
+- Fix assert crash when updating 3D content of a Scene3D item [QTBUG-60613]
+- Fix crash when loading multiple assimp scenes
+- Fix shader compilation on Rasp-Pi [QTBUG-59349]
+- Don't deref null VAOs [QTBUG-59349]
+- Respect byteStride in QAttribute
+- Don't crash when rapidly changing textures
+- Ignore ill-formed faces in OBJ files
+- Many performance and memory use reduction changes