Add changes file for Qt 5.12.5

+ 712aabd074 Adapt wording of documentation license
+ faf46dfbcb embedded: Document more output mode values for drm
+ 092e708a7c QNX: List utilities needed for deploying apps to QNX devices
+ 9dc3bd8fea Doc: Improve CMake code example
+ 2fa86c4279 Android: Update OpenSSL page
+ 2eb2e153f0 Bump version
+ 4ef5512d62 Android: Update OpenSSL 1.1 docs
+ 8c6b313531 Update CMake Macro reference

Change-Id: I4cf7775ae1d2966695206b1bc0bca811b7fa05da
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

dist/changes-5.12.5

@@ -0,0 +1,20 @@
+Qt 5.12.5 is a bug-fix release. It maintains both forward and backward
+compatibility (source and binary) with Qt 5.12.0 through 5.12.4.
+
+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 5.12 series is binary compatible with the 5.11.x series.
+Applications compiled for 5.11 will continue to run with 5.12.
+
+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.