dev-lang/erlang: fix lib/asn1 depend, bug #705500

dev-lang/erlang: fix lib/asn1 depend, bug #705500

The build failure is reproducible on a 4-core CPU when using
massive parallelism:

```
$ make -j21 -l4
...
 GEN    asn1ct_eval_ext.erl
{"init terminating in do_boot",
  {undef,[{asn1ct_func,start_link,[],[]},
          {prepare_templates,gen_asn1ct_eval,1,
           [{file,"prepare_templates.erl"},{line,58}]},
            {init,start_it,1,[]},{init,start_em,1,[]}]}}
init terminating in do_boot ()

Crash dump is being written to: erl_crash.dump...done
make[2]: *** [Makefile:139: asn1ct_eval_ext.erl] Error 1
```

Here `asn1ct_eval_ext.erl` attempts to load `asn1ct_func.beam`
via `prepare_templates.erl` before it's compiled into `.beam` file.

The change pulls in a dependency on `asn1ct_func.beam`.

Reported-by: WGH
Closes: https://bugs.gentoo.org/705500
Package-Manager: Portage-2.3.84, Repoman-2.3.20
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>