[gnutls-devel] GnuTLS | configure.ac: check libopts version more strictly (!862)

[Development of GNU's TLS library]

New Merge Request !862

https://gitlab.com/gnutls/gnutls/merge_requests/862

Branches: tmp-libopts-check to master
Author:    Daiki Ueno
Assignee:  
Approvers: Simon Josefsson, Nikos Mavrogiannopoulos, Dmitry Eremin-Solenikov, Hubert Kario, Tim Rühsen, Andreas Metzler, Tom, Ander Juaristi, Tomáš Mráz, Anderson Sasaki and GnuTLS devel mailing list


This is a continuation of the discussion in:
https://gitlab.com/gnutls/gnutls/merge_requests/808#note_124782407

In libopts there are two places where library versions are checked: at [source code level](http://git.savannah.gnu.org/cgit/autogen.git/tree/autoopts/tpl/opthead.tlib#n60) and [binary level](http://git.savannah.gnu.org/cgit/autogen.git/tree/autoopts/init.c#n75).

These are basically the same condition, but we can't do much about the latter (e.g., copying a linked binary to older distributions).

## Checklist
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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