Add changes file for Qt 5.12.1

+ 9fcf2a90 Bump version
+ 92ae7296 Add changes file for Qt 5.11.3
+ 62ee0320 Clean up windows qmake scopes
+ d369df14 Doc: Add missing closing parenthesis in snippet
+ 7844b913 Fix compilation with gcc 4.8
+ 0eb8ff63 Only include the ssl example and test if the OpenSSL feature is available
+ 8eeb2154 SSL Examples: Explicitly state SSL requirement
+ 76819c03 Convert QNX backend to use shared pointers
+ b513d17f Clang warning cleanup in qnx backend
+ b89cee78 QVariant is also a standalone type and we must treated accordingly
+ ab6e0edd

 Bump version

Change-Id: I5ce74358fa5e1324f1ecdc3a0e28ae411b19db8f
Reviewed-by: Michael Brasser <michael.brasser@live.com>