[Midnightbsd-cvs] src: sysctl.h: explain it must be static

[laffer1 at midnightbsd.org]

Log Message:
-----------
explain it must be static

Modified Files:
--------------
    src/sys/sys:
        sysctl.h (r1.9 -> r1.10)
        (http://cvsweb.midnightbsd.org/src/sys/sys/sysctl.h?r1=1.9&r2=1.10)