Lintian tag information: debian-rules-sets-dpkg-architecture-variable (type: warning)

Description (from lintian-explain-tags)

The debian/rules file sets one or more dpkg-architecture variables such as
DEB_BUILD_ARCH.

These variables are pre-initialized in the environment when running under
dpkg-buildpackage - avoiding these assignments can reduce package build
time.

Please use:

include /usr/share/dpkg/architecture.mk

instead, or replace the assignment operator with ?=.

Please refer to the dpkg-architecture(1) manual page for details.

Visibility: warning
Show-Always: no
Check: debian/rules

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