Add changes file for Qt 5.15.1

+ 33549ee35f CMake: Fix TOC
+ 5e207d3aec Update uic, rcc command line help to reflect Python usage
+ 6a080760bb Document new flags and env.vars. for Windows OpenGL
+ 086dcc8c9d Remove -qt-xcb from linux documentation
+ c8458acf4c Specify that iOS 13.2 SDK is required for Qt
+ 8006bf9f94 Doc: Add Qt distance field generator to the list of tools
+ d089c60dfd Doc: Add cmake instructions for app icon setup
+ fc94e5c5cf Explain that qmlscene automatically creates windows for bare Items
+ 64a0b3a31a Redefine supported platforms and compilers
+ f1a522e3f6 Support ICC 19.1 instead of ICC 18
+ 94876f4ae3 Doc: Add info on how to install docs
+ 7a1a9d372c Doc: Add libxcb-xinerama0-dev to suggested packages for Linux
+ 2c038f10d6 Remove tech preview section from 5.15 docs
+ 95ec925c12 Add Qt Marketplace entry to Qt Licensing page
+ 0dcb328b03 Document the requirements of Linux Accessibility
+ f440a3e1ed Indicate that SQLite was updated to 3.32.3
+ dba7e708d1 Bump version
+ 21083c4407 Fix "rectange" typo
+ 9c83b672f1 Update emsdk install example
+ a43c74bc1c Doc: Remove Qt Quick Controls 1 Example from Overview page

Change-Id: I3abf17b9310ac3a691b568f347788988391561d8
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
(cherry picked from commit 0aead2ee97)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

dist/changes-5.15.1

@@ -0,0 +1,20 @@
+Qt 5.15.1 is a bug-fix release. It maintains both forward and backward
+compatibility (source and binary) with Qt 5.15.0.
+
+For more details, refer to the online documentation included in this
+distribution. The documentation is also available online:
+
+https://doc.qt.io/qt-5/index.html
+
+The Qt version 5.15 series is binary compatible with the 5.14.x series.
+Applications compiled for 5.14 will continue to run with 5.15.
+
+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.
+
+ - This release contains only minor code improvements.