qt5base: fix qthash error attribute(target("+crc")) is unknown

Add patch 0005-Fix-error-attribute-target-crc-is-unknown.patch.

Upstream: https://codereview.qt-project.org/200171

Fixes buildroot Bug 9916 ([1]).

[1] https://bugs.busybox.net/show_bug.cgi?id=9916



Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>