bpo-34366: fix FreeBSD with both system lib and libuuid present #8711
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It is entirely possible for a FreeBSD (or another) system to have both
system uuid.h + -lc and external uuid/uuid.h + -luuid libraries
installed simultaneously. If that is the case, prefer the system
library (to avoid unnecessary dependencies) and make sure that the code
does not attempt to combine both.
https://bugs.python.org/issue34366