Make this bugger actually compile and work again:

o a couple of header files have been missing

o convert the LKM Makefile to use <bsd.kmod.mk>

o rename the module to `misc_mod'' (as opposed to `miscmod''), so

the module name can be made identical to the module's file name,
avoiding the clash with one of the component's .o file names

o modstat(1/8) has been moved meanwhile