Bug#895177: invada-studio-plugins-lv2 FTCBFS: uses build architecture build tools

[Helmut Grohne]

Source: invada-studio-plugins-lv2
Version: 1.2.0+repack0-8
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

invada-studio-plugins-lv2 fails to cross build from source, because it
uses some build architecture build tools. Notably, it hard codes the
build architecture pkg-config in the upstream build system. Then it
uses the build architecture compiler as the value for LD. The former is
easily fixed by making it overridable (and dh_auto_build passes that).
For LD, it is already indirected through a variable, but dh_auto_build
cannot know the right value as for some packages it needs to be a C++
linker. So it is best to default LD from CC or CXX respectively. The
attached patch implements all of that and makes
invada-studio-plugins-lv2 cross build successfully. Please consider
applying it.

Helmut
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