jq: add 1.3, mask scm, use autotools

- jq has had a stable release, so add that and mask the scm version.

- The build system now uses autotools. There is a bug in the makefile
  that prevents it from using the latest automake, which has been reported
  upstream. Until that is fixed, we can use automake:1.12.
Merge pull request #1 from lipidity/update-jq

jq: add 1.3, mask scm, use autotools