[Pkg-cmake-team] Bug#1085507: cmake: fails to recognize multiarch libdir for musl-linux-any

[Helmut Grohne]

Package: cmake
Version: 3.30.5-1
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap
Control: affects -1 + src:libpng1.6

While bootstrapping Debian for musl-linux-any, I noticed that cmake
fails to consider /usr/lib/$DEB_HOST_MULTIARCH during a build of
libpng1.6. After some debugging, it became clear that it would only
recognize multiarch directories for glibc based systems and eventually,
I found the culprint in Linux-Initialize.cmake. I'm attaching a patch
that makes cmake recognize the multiarch directories for all Linux
systems rather than just GNU/Linux ones.

Helmut
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