Subject: frama-c should probably be wrapped

From: raingloom <[email-masked]>
Date: Fri, 20 May 2022 13:36:54 +0200

Sorry, can't debug this further right now.

```
$(guix build frama-c)/bin/frama-c
[kernel] User Error: [findlib] package 'ocamlgraph' not found (required by `frama-c.kernel')
[kernel] User Error: Deferred error message was emitted during execution. See above messages for more information.
[kernel] Frama-C aborted: invalid user input.
```

Running it with `guix shell frama-c -- frama-c` just makes it exit
without any output.