- Allow clock subsystem to be compiled without the apic support [0]

- ATPIC, on pc98 is never defined somewhere, differently from i386.
  Turn its compilation to be conditional as i386 does. [1]

[0] Reported by:	nyan
[1] Submitted by:	nyan

sys/conf/files.pc98

@@ -194,7 +194,7 @@ i386/ibcs2/ibcs2_util.c		optional ibcs2
 i386/ibcs2/ibcs2_xenix.c	optional ibcs2
 i386/ibcs2/ibcs2_xenix_sysent.c	optional ibcs2
 i386/ibcs2/imgact_coff.c	optional ibcs2
-i386/isa/atpic.c		standard
+i386/isa/atpic.c		optional atpic	
 #i386/isa/atpic_vector.s		standard
 i386/isa/elink.c		optional ep | ie
 i386/isa/isa.c			optional isa
@@ -240,7 +240,7 @@ pc98/cbus/gdc.c			optional gdc
 pc98/cbus/nmi.c			standard
 pc98/cbus/olpt.c		optional olpt
 pc98/cbus/pckbd.c		optional pckbd
-pc98/cbus/pcrtc.c		standard
+pc98/cbus/pcrtc.c		optional atpic
 pc98/cbus/pmc.c			optional pmc
 pc98/cbus/scgdcrndr.c		optional sc gdc
 pc98/cbus/scterm-sck.c		optional sc

sys/i386/isa/clock.c

@@ -65,9 +65,7 @@ __FBSDID("$FreeBSD$");
 #include <machine/frame.h>
 #include <machine/intr_machdep.h>
 #include <machine/md_var.h>
-#ifdef DEV_APIC
 #include <machine/apicvar.h>
-#endif
 #include <machine/ppireg.h>
 #include <machine/timerreg.h>
 #include <machine/smp.h>

sys/pc98/cbus/clock.c

@@ -67,9 +67,7 @@ __FBSDID("$FreeBSD$");
 #include <machine/frame.h>
 #include <machine/intr_machdep.h>
 #include <machine/md_var.h>
-#ifdef DEV_APIC
 #include <machine/apicvar.h>
-#endif
 #include <machine/ppireg.h>
 #include <machine/timerreg.h>
 #include <machine/smp.h>

sys/pc98/conf/DEFAULTS

@@ -24,3 +24,6 @@ device		uart_ns8250
 # Default partitioning schemes
 options 	GEOM_PART_BSD
 options 	GEOM_PART_PC98
+
+# enable support for native hardware
+device		atpic