[Merge] ~bluca/ubuntu/+source/dpkg:fix_build_profiles_env into ubuntu/+source/dpkg:ubuntu/devel

[Luca Boccassi]

You have been requested to review the proposed merge of ~bluca/ubuntu/+source/dpkg:fix_build_profiles_env into ubuntu/+source/dpkg:ubuntu/devel.

For more details, see:
https://code.launchpad.net/~bluca/ubuntu/+source/dpkg/+git/dpkg/+merge/461078

Due to the change in dpkg-buildpackage.pl to always call set_build_profiles()
DEB_BUILD_PROFILES is never parsed, even if there is no --build-profile
command line argument.

When set_build_profiles() is called with an empty array, meaning
that there were no overrides via --build-profile, check the env
var instead.

Test case added to cover this use case.

-- 
Your team Ubuntu Sponsors is requested to review the proposed merge of ~bluca/ubuntu/+source/dpkg:fix_build_profiles_env into ubuntu/+source/dpkg:ubuntu/devel.
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