heimdal: Add 64-bit integer support to ASN.1 compiler, part 1

[dim]

Summary

Import upstream 19d378f44:

ASN.1 INTEGERs will now compile to C int64_t or uint64_t, depending
on whether the constraint ranges include numbers that cannot be
represented in 32-bit ints and whether they include negative
numbers.

Template backend support included.  check-template is now built with
--template, so we know we're testing it.

Tests included.

This is a direct application of the upstream patch, but it DOES NOT compile.

[cy]

There is no need to touch Makefile.am. We don't use it.

crypto/heimdal/lib/asn1/test.asn1

11

We don't use test.asn1.

[emaste]

crypto/heimdal/lib/asn1/test.asn1

11

IMO it makes sense to just apply the upstream patch though, there's not much value in going out of our way to undo part of it.

[cy]

Except for the files we don't use, LGTM.