Bug#851814: apt-build: Broken postinst by less permissive sed

[Axel Beckert <abe@debian.org>]

Hi Santiago,

Santiago Vila wrote:
> Setting up apt-build (0.12.45) ...
> sed: character class syntax is [[:space:]], not [:space:]
> dpkg: error processing package apt-build (--configure):
>  subprocess installed post-installation script returned error exit
> status 4
> Processing triggers for man-db (2.7.6.1-2) ...
> Errors were encountered while processing:
>  apt-build
> 
> Discovered by Antonio Trujillo here:
> 
> https://lists.debian.org/msgid-search/dd7864af-d235-217c-74dc-bd1b5a086e83@juntadeandalucia.es

Thanks for forwarding it. Such issues are not detected by just having
the package installed and using it occasionally. But triggering a
reinstallation showed it here, too.

> I think the following trivial patch should fix it,

Thanks for the patch. I'll do an QA upload soon.

> but I'm not confident enough to push it to git because version in
> Debian archives does not exactly match HEAD in git.

Yes, I understand. Point is that when I did the first QA upload there
were (seemingly dead) ITA-traces in the Git master brnach and I didn't
want to throw them away, so for the last RC-fix (back then for
Jessie), I branched off a branch named "jessie" based on the lasted
upload to Unstable. I now did the same for Stretch: Created a branch
"stretch" based on the branch "jessie". As soon as I've uploaded
apt-build, I'll merge back my changes into the "master" branch.

		Regards, Axel
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