[Bug 231402] textproc/kf5-syntax-highlighting: does not build on systems with VLAN interfaces

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231402

--- Comment #16 from Adriaan de Groot <adridg at freebsd.org> ---
I've been debug-chasing this for a few days in an 11.2 VM. The goal is to allow
genericbearer to load -- that is, the environment-variable workaround should
not be necessary. As Ting-Wei Lan pointed out originally, everything looks like
memory corruption **somewhere**.

 - removing the call to get the interfaceFromIndex(0) fixes the problem
 - I found a spot in QNetworkInterface where adding qWarning() << "foo" fixes
the problem

When build WITH_DEBUG=yes I get crashes (SEGV), rather than unresolved symbols:
more hint that it's memory corruption. In any case: *because* this is
corrupting memory from a Qt-internal method that is listing network interfaces,
I would like to fix the root cause rather than working around things.

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