jq: new package

jq is like sed for JSON data - you can use it to slice and filter
and map and transform structured data with the same ease that sed,
awk, grep and friends let you play with text.

[Peter: fix license, add flex/bison deps, force c99]
Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>