buildroot

jq: disable maintainer mode

Since version 1.5, maintainer mode is enabled by default. We don't need
this, and is in particular problematic because it requires bison 3.0.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>