Add changes file for Qt 5.12.5

+ 712aabd0 Adapt wording of documentation license
+ faf46dfb embedded: Document more output mode values for drm
+ 092e708a QNX: List utilities needed for deploying apps to QNX devices
+ 9dc3bd8f Doc: Improve CMake code example
+ 2fa86c42 Android: Update OpenSSL page
+ 2eb2e153 Bump version
+ 4ef5512d Android: Update OpenSSL 1.1 docs
+ 8c6b3135

 Update CMake Macro reference

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