document and incorporate the perl ping module patch

[sarcasticadmin]

Description

per @owendelong message in signal there is a patch that should be incorporated into the ping perl module. Lets document this for others and we can also incorporate this into the patch within our nix shell.

Patch:

% diff dist_[Ping.pm](http://ping.pm/) od_[Ping.pm](http://ping.pm/) 
230c230
<     croak("icmp ping requires root privilege") if !_isroot();
---
>     croak("icmp ping requires root privilege") if !_isroot() && ($^O ne "linux");
235,236c235,244
<     socket($self->{fh}, PF_INET, SOCK_RAW, $self->{proto_num}) ||
<       croak("icmp socket error - $!");
---
>     if ($^O eq "linux")
>     {
> 	    socket($self->{fh}, PF_INET, SOCK_DGRAM, $self->{proto_num}) ||
> 	      croak("icmp socket error - $!");
>     }
>     else
>     {
> 	    socket($self->{fh}, PF_INET, SOCK_RAW, $self->{proto_num}) ||
> 	      croak("icmp socket error - $!");
>     }
253,254c261,270
<     socket($self->{fh}, $AF_INET6, SOCK_RAW, $self->{proto_num}) ||
<       croak("icmp socket error - $!");
---
>     if ($^O eq "linux")
>     {
> 	    socket($self->{fh}, $AF_INET6, SOCK_DGRAM, $self->{proto_num}) ||
> 	      croak("icmp socket error - $!");
>     }
>     else
>     {
> 	    socket($self->{fh}, $AF_INET6, SOCK_RAW, $self->{proto_num}) ||
> 	      croak("icmp socket error - $!");
>     }

Acceptance Criteria

• patch is more widely know and documented for the teams
• patch incorporated into default nix shell

[djacu]

This should be trivial to add to the overlays once #800 is merged.

Need more info from @owendelong about which package needs patching. I'm not able to infer it from the patch above.