Bug#1025360: guetzli FTCBFS: hard codes the build architecture pkg-config

[Helmut Grohne]

Source: guetzli
Version: 1.0.1-1
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

guetzli fails to cross build from source, because it hard codes the
build architecture pkg-config and thus fails locating libpng. I'm
attaching a patch for your convenience.

Helmut
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