Bug#854784: rely on DEB_BUILD_OPTIONS for trigerring custom optimized build

[Sébastien Villemot]

Package: src:openblas
Severity: wishlist

As explained in README.Debian, it is possible to build a locally optimized
target-specific package of OpenBLAS by using a custom rule in debian/rules.

It would be nicer to use DEB_BUILD_OPTIONS=custom as the interface for
triggering that build (see the discussion in
https://lists.debian.org/debian-science/2017/02/msg00047.html).

-- 
 .''`.    Sébastien Villemot
: :' :    Debian Developer
`. `'     http://sebastien.villemot.name
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