Implicitly include <sys/param.h> so that __FreeBSD_version checks wor… #2114
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Implicitly include <sys/param.h> so that __FreeBSD_version checks work properly
Summary
Description
Implicitly include <sys/param.h> on all code files in psutil/arc/freebsd that make use of __FreeBSD_version.
While some code already includes it directly and others pull it in indirectly via other includes, mem.c was not and made __FreeBSD_version checks silently fail on some common FreeBSD installations, including default setups with FreeBSD on arm platforms.