This linker option is now deprecated (and not needed,
since stack traces always contain demangled symbols).
Change-Id: If42c692c006b214fa3df418c09680aaa07ea2bbd
Reviewed-by: Piotr Wierciński <piotr.wiercinski@qt.io>
(cherry picked from commit a8b7da59cba56b535393f50cd7432a412021d8d2)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>