gr-iqbal needs branch support added

[dkozel]

As found in: gnuradio/gnuradio#4154

The gr-iqbal OOT uses branches for the different GR versions (yey!) but the PyBOMBS recipe doesn't select the correct branch based on the GNU Radio version used.

[Timvrakas]

This just tripped me up. I fixed it with several checkout origin/gr3.8s in the right place, but it's a roadblock to a fresh install.

[Abraxas3d]

It still seems to be a problem.

Attempted to install 3.9 with Pybombs to get around the Ubuntu package install producing the following failure (documented elsewhere by several others).

Generating: '/home/abraxas3d/Documents/GNU-Radio-Flowgraphs/spyon915.py'
Generate Error: 'catch_exceptions'
>>> Failure

But, iqbal won't install.

-mdt