Pull up following revision(s) (requested by isaki in ticket #594):

sys/arch/x68k/include/param.h: revision 1.29

Bump MSGBUFSIZE (2 * NBPG).

Since timestamp was introduced, it was too small to store full dmesg
of one boot.

And putting this behind of #include <m68k/param.h> had no effect.

This was fixed on many arch in 1997 but x68k was not...
http://mail-index.netbsd.org/source-changes/1997/09/20/0021.html

(martin)