package/ijs: New package ijs 0.35

[Thomas:
  - Add BR2_USE_MMU dependency, since fork() is used.
  - Put <pkg>_SOURCE next to <pkg>_VERSION and <pkg>_SITE.
  - Improve comment about why autoreconf is needed.
  - Change the location in menuconfig of the package, "Networking
    applications" didn't seem like an appropriate location.]

Signed-off-by: Olivier Schonken <olivier.schonken@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>