Bug#1033488: Idea: use CROSS_GRADE_TO_ARCH, if set.

[Geert Stappers]

> cross-grading an ARM system from armhf to arm64

Idea for supporting such corner cases


    if environmentvariable CROSS_GRADE_TO_ARCH is set
        use it
    else
        dpkg --print-architecture



Groeten
Geert Stappers
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