[openssl/openssl] 449e1c: Adapt C compiler detection for VSI C on x86_64

[Richard Levitte]

  Branch: refs/heads/openssl-3.1
  Home:   https://github.com/openssl/openssl
  Commit: 449e1c5c3013d2e99fc8ef39f145ddbcc49fac8c
      https://github.com/openssl/openssl/commit/449e1c5c3013d2e99fc8ef39f145ddbcc49fac8c
  Author: Richard Levitte <levitte at openssl.org>
  Date:   2023-11-23 (Thu, 23 Nov 2023)

  Changed paths:
    M util/perl/OpenSSL/config.pm

  Log Message:
  -----------
  Adapt C compiler detection for VSI C on x86_64

VSI C on OpenVMS for x86_64 has a bit more information than on other
hardware.  This is no doubt because it's based on LLVM which leaves an
opening for cross compilation.

VSI C on Itanium:

    $ CC/VERSION
    VSI C V7.4-001 on OpenVMS IA64 V8.4-2L3

VSI C on x86_64:

    $ CC/VERSION
    VSI C x86-64 X7.4-843 (GEM 50XB9) on OpenVMS x86_64 V9.2-1

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22792)

(cherry picked from commit df5e72d220d9c8b9316b1ce8e8c8bdf23c7201f0)