lalfr-paste segfaults when reading frameCPP test file

Using the framecpp_sample utility from ldas-tools-framecpp I can create a GWF file on-the-fly, but then lalfr-paste falls over when trying to read it:

$ framecpp_sample --duration 4
$ lalfr-paste Z-ilwd_test_frame-600000000-4.gwf > /dev/null
XLAL Error - XLALFrameUFrAdcDataNew (/home/conda/feedstock_root/build_artifacts/lalframe-split_1611942888588/work/lib/LALFrameL.c:916): Wrong or unknown type
XLAL Error - XLALFrameUFrChanAlloc (/home/conda/feedstock_root/build_artifacts/lalframe-split_1611942888588/work/lib/LALFrameL.c:966): Internal function call failed: Wrong or unknown type
Segmentation fault

I think this is just becasuse LALFrameL.c isn't set up to handle the more exotic types. I'm attempting a patch...

/cc @jolien-creighton @ed-maros