Remove the #include of sys/param.h. It was meant to improve portability

Remove the #include of sys/param.h.  It was meant to improve portability
for BSD less than 4.4 where sys/cdefs.h DNE but can be simulated with
param.h.  Unfortunately, the additional include did little to actually
improve portability since we've lost portability in several other chunks
of make code (err(), sysctlbyname(), probable more).

Partly submitted by:	bde