Declare structure before using it in prototypes, and declare atol()
for configurations which don't have or don't use <stdlib.h>. (Some
#ifdef MICRO code for atoi at the end of system.h might need to be done
for atol too.)
Finally got around to installing OpenBSD (rev 3.3) in a vmware partition.
Found that several #if BSD's were inappropriate for modern BSD's. Haven't
installed FreeBSD or NetBSD, but based on reading their man pages,
these changes are needed there too. Mostly due to POSIX time() signature.
this particular fix has been sitting around my inbox for a while although
we've had reports of FreeBSD build problems for a long time. While it's
untested, it certainly looks like the unfixed system.h had a case that
could not be reached. bsdi seems like it needs to be handled the same way.
