Patch for use Peder Stray's perl-rename package

[Joan Figueras]

Hello. In Archlinux the official package perl-rename comes from this 
Perl module [1] by Peder Stray.

The syntax is a bit different from Robin Barker's File::Rename used in 
makeicecat.

I've written a patch that distinguish what is the installed package and 
then apply the correct syntax. Perhaps is a bit dirty, but it works on 
my system (attached).

Also I saw that these regexp 's/fennec/icecatmobile/;' and 
's/Fennec/IceCatMobile/;' in apply_batch_branding() are not necessary 
anymore. Seems that perl-rename from Robin Barker returns 0 in case 
there isn't a match. Peder Stray's perl-rename returns 1 in that case. 
So I've removed it.

For now, this patch is included in IceCat's Archlinux AUR package. But 
it would be great if is accepted upstream.

Thank you
Cheers
--
Joan

PD: Probably there is a better coding to do it :p

[1] https://search.cpan.org/~pederst/rename/

perl-rename.patch
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