Bug#894837: plotdrop FTCBFS: uses build architecture build tools

[Helmut Grohne]

Source: plotdrop
Version: 0.5.4-1
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

plotdrop fails to cross build from source, because its Makefile hard
codes build architecture build tools. It uses bare pkg-config, which is
the build architecture one. dh_auto_build passes a cross $(PKG_CONFIG)
and all the Makefile has to do is pick it up. Furthermore, it uses the
-s option for the install command, which strips using the build
architecture strip. Besides breaking cross compilation, it also breaks
-dbgsym packages, so it is best left to dh_strip. Please consider
applying the attached patch.

Helmut
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