FindPkgConfig: don't try multiarch paths on non-multiarch Debian
The following discussion from !1571 (closed) should be addressed:
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@ben.boeckel commented on a discussion: (+2 comments)
The FindPkgConfig
module checks if /etc/debian_version
exists, but not its version number, to decide whether to do multiarch path support. Older Debian versions should also do the older lib32
logic.