[Perl/perl5] 73d66f: locale.c: Handle locale names with '@'

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 73d66f354cd4df0324b11e46af48f66bd5c1dd15
      
https://github.com/Perl/perl5/commit/73d66f354cd4df0324b11e46af48f66bd5c1dd15
  Author: Karl Williamson <k...@cpan.org>
  Date:   2022-10-31 (Mon, 31 Oct 2022)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Handle locale names with '@'

The XPG locale name standard says the codeset is the part of the name
after any dot, terminated by the end of string or an '@'.

Prior to this commit, the possibility of an '@' was not considered.