Bug#846520: pcl: enable parallel builds on 32 bit arches

[Jochen Sprickerhof]

Hi Emilio,

* Emilio Pozuelo Monfort <pochu at debian.org> [2016-12-01 22:24]:
> Why was this disabled? Do the builds run out of memory often? It'd be good
> to re-enable this, the speedup is huge and it would avoid taking one buildd
> for a day and a half on some architectures.

Exactly because it was running out of memory. Quoting from the buildd:

| cc1plus: out of memory allocating 903468 bytes after a total of 19152896 bytes

I asked in #debian-buildd back then and the consensus was to remove the
--parallel. Is there any reason to revert this now?

Cheers Jochen
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