[Perl/perl5] 8f9383: Errno: also escape osvers

[Tony Cook via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 8f938394298b9fe7e9430dfb4f4727452811d970
      
https://github.com/Perl/perl5/commit/8f938394298b9fe7e9430dfb4f4727452811d970
  Author: Tony Cook <t...@develop-help.com>
  Date:   2023-07-03 (Mon, 03 Jul 2023)

  Changed paths:
    M ext/Errno/Errno_pm.PL

  Log Message:
  -----------
  Errno: also escape osvers

Partly fixes #21135

Tested by Configuring with

  ... -Darchname='x86_64-linux@alpha' -Dosvers='4.19.0@beta'