libremakepkg: when prefixing output with ' | ', do better than sed.

There are two downsizes to using sed; it line-buffers, and (the existing
pattern) doesn't handle '\r'.

So, now I've included a Perl helper program to do a better job.

I'd originally written it in C, and while that version was faster (the Perl
version stutters occasionally), it required recompilation for different
architectures.  I could have gotten around that with tcc, but I didn't want
to add any dependencies.  Which is why I settled on Perl.  It's part of
group=(base), and it is required by packages in group=(base-devel), so I
can count on it always being there.

It doesn't handle every movement character, just '\n' and '\r', but that's
enough for curl and pacman.

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