Remove some of the asn1c and uthash glue code

Remove some of the asn1c and uthash glue code

The asn1c stuff was autogenerated, and the uthash stuff was copy-pasted
from its source project.

None of it serves any purpose. I'm not allergic to the possibility of
supporting these other environments, but this is not the time for it.
Also, it probably doesn't work anyway, since it has never been tested
in the context of Fort.

This doesn't delete all the glue code; only the necessary parts needed
for the upcoming commit.