qt: fix execution on ARC

Even though Qt4 could be built for ARC cores during execution
of Qt4 applications on target issues will happen.

Most notable is will be segfaults due to unaligned access to data,
especially in WebKit applications.

Both patches were submitted upstream and if they ever get accepted
they should be removed from Buildroot.

https://codereview.qt-project.org/#/c/112667
https://codereview.qt-project.org/#/c/112668



[Thomas: renumber patches.]

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Anton Kolesov <akolesov@synopsys.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>