various coverity-inspired fixes

. some strncpy/strcpy to strlcpy conversions
	. new <minix/param.h> to avoid including other minix headers
	  that have colliding definitions with library and commands code,
	  causing parse warnings
	. removed some dead code / assignments

drivers/pci/pci.c

@@ -12,6 +12,7 @@ Created:	Jan 2000 by Philip Homburg <philip@cs.vu.nl>
 #include <minix/com.h>
 #include <minix/ds.h>
 #include <minix/syslib.h>
+#include <minix/param.h>
 
 #include "pci.h"
 #include <machine/pci_amd.h>