[Perl/perl5] 6c8e11: hints/solaris_2.sh: g++ needs same treatment as gcc

[Karl Williamson]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 6c8e1158f1772eedb813932444244e833799a032
      
https://github.com/Perl/perl5/commit/6c8e1158f1772eedb813932444244e833799a032
  Author: Karl Williamson <k...@cpan.org>
  Date:   2020-01-21 (Tue, 21 Jan 2020)

  Changed paths:
    M hints/solaris_2.sh

  Log Message:
  -----------
  hints/solaris_2.sh: g++ needs same treatment as gcc

This had a test for gcc, which also applies to g++, and it was causing
load failures on solaris built with g++.

Thanks to Dagfinn Ilmari Mannsåker for diagnosing this problem.