PackageApplication patch which allows keychain specifying for codesign

PackageApplication.patch

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>              "keychain|k=s",
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>     if ( $opt{keychain} ) {
>         push(@codesign_args, '--keychain');
>         push(@codesign_args, $opt{keychain});
>     }
> 
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< PackageApplication [-s signature] application [-o output_directory] [-verbose] [-plugin plugin] || -man || -help 
---
> PackageApplication [-s signature] [-k keychain] application [-o output_directory] [-verbose] [-plugin plugin] || -man || -help 
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>     -k              keychain name to use in a codesign
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> =item B<-k>
> 
> Keychain name which should be used in a codesign. If provided, the application will search for identity common name in a specified keychain.
>