Bug#993123: frog FTCBFS: hard codes the build architecture pkg-config

[Helmut Grohne]

Source: frog
Version: 0.20-2
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

frog fails to cross build from source, because configure.ac hard codes
the build architecture pkg-config in one place (after correctly
detecting the host architecture one). Simply using the correct
substitution variable makes frog cross buildable. Please consider
applying the attached patch.

Helmut
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