[Midnightbsd-cvs] src: sys/sys: Implement a minimum version check for kernel modules.

[laffer1 at midnightbsd.org]

Log Message:
-----------
Implement a minimum version check for kernel modules.  When built, the midnightbsd version is used as a baseline version (__MidnightBSD_version)

This is based on a patch / idea from John Baldwin.

Modified Files:
--------------
    src/sys/kern:
        kern_module.c (r1.3 -> r1.4)
        (http://cvsweb.midnightbsd.org/src/sys/kern/kern_module.c?r1=1.3&r2=1.4)
    src/sys/sys:
        module.h (r1.4 -> r1.5)
        (http://cvsweb.midnightbsd.org/src/sys/sys/module.h?r1=1.4&r2=1.5)