GCC and Clang support compiler intrinsic error detections tools:
address, memory, thread, undefined
Let users conveniently enable it in qmake, for instance with
CONFIG += sanitizer sanitize_address
Also add a -sanitize [...] option to configure to use it by default
for both the Qt libraries, and user applications.
[ChangeLog][configure] Added support for GCC/Clang -fsanitize= options
Change-Id: Ie5418abcdf41842566df510d7707e41739e66f87
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
