Bug#1006720: fontconfig: frozen in FcMutexLock, via FcCacheFindByAddr

[Vincent Lefevre]

Control: reassign -1 libfontconfig1 2.13.1-4.4
Control: tags -1 upstream

This actually occurred in the library.

Note: I could not reproduce the issue yet.

But the fccache.c code looks wrong. I'm going to report the bug
upstream.

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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