QtTest is not under the same Binary Compatibility guarantees as the
other modules, but let's try and do it where it's easy.
The toString() method can simply be removed from the header because it's
not a member function. Its deprecation wasn't marked with a version
number, so it starts now with 6.8.
Change-Id: Ie28eadac333c4bcd8c08fffd17c54faca7057b9c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Thiago Macieira