buildroot

jq: enable host package

Allow building jq as host utility for use in post-build scripts.
This can be useful to created, edit, merge or even perform syntax checking
on JSON files.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>