qtwebengine: backport patches to fix ARM build failures

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
qtbase: fix path to external hostbindir binaries

This fixes syncqt.pl not being included in qtbase-tools.

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
qtwebengine: whitelist supported architectures

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
README: update for dizzy release

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>