[openssl/openssl] d2c643: util/mkdef.pl: Take shlib_variant into account

[Richard Levitte]

  Branch: refs/heads/OpenSSL_1_1_1-stable
  Home:   https://github.com/openssl/openssl
  Commit: d2c6435cd739811def28f6809db0fd068f5cdc60
      https://github.com/openssl/openssl/commit/d2c6435cd739811def28f6809db0fd068f5cdc60
  Author: Richard Levitte <levitte at openssl.org>
  Date:   2023-05-25 (Thu, 25 May 2023)

  Changed paths:
    M util/mkdef.pl

  Log Message:
  -----------
  util/mkdef.pl: Take shlib_variant into account

For platforms using import libraries, the lack of this causes a
disjoint between the name of the DLL that's produced, and the
corresponding import library.

Fixes #20942 (follows up #20732)

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20968)