`lib/asn1/check-gen.c` almost works with templates, and is a pretty
extensive test. The only thing that fails is everything to do with
IMPLICIT tags (so, `test_implicit()`).
So now we compile `lib/asn1/test.asn1` both, w/ and w/o templating, and
we build two programs from `lib/asn1/check-gen.c`: `check-gen` and
`check-gen-template`, respectively linking with the non-templated and
the templated compilation of `lib/asn1/test.asn1`.
Because the template compiler still doesn't support IMPLICIT tagging
well, we disable testing of IMPLICIT tags in `check-gen-template`.
This will make it much harder to break the template compiler in the
future.
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