dnsrend 0.08 (new formula)

dnsrend is a DNS message dissector, showing excruciating detail to diagnose
malformed message contents.
OK, this is the last thing to fix then.

So, using bin.env_script_all_files only creates a wrapper script with an environment variable set. It doesn't override the way Perl is called. To be more specific, if I run `bin.env_script_all_files(libexec + "bin", :PERL5LIB => ENV["PERL5LIB"])` the wrapper script that is created contains:

`PERL5LIB="/usr/local/Cellar/dnsrend/0.08/libexec/lib/perl5" exec "/usr/local/Cellar/dnsrend/0.08/libexec/bin/dnsrend" "$@"`

I want instead to have:

`/usr/bin/env perl -Tw -I #{libexec}/lib/perl5 "/usr/local/Cellar/dnsrend/0.08/libexec/bin/dnsrend" "$@"`.

How to achieve that?