Added a Makefile for the sun2 includes.

sys/arch/sun2/include/Makefile

@@ -0,0 +1,25 @@
+#	$NetBSD: Makefile,v 1.1 2001/06/27 19:22:18 fredette Exp $
+
+KDIR=	/sys/arch/sun2/include
+INCSDIR= /usr/include/sun2
+
+INCS=	ansi.h aout_machdep.h asm.h autoconf.h \
+	bswap.h \
+	cdefs.h cpu.h \
+	db_machdep.h disklabel.h dvma.h \
+	eeprom.h elf_machdep.h endian.h endian_machdep.h \
+	float.h frame.h \
+	idprom.h ieee.h ieeefp.h intr.h \
+	int_const.h int_fmtio.h int_limits.h int_mwgwtypes.h int_types.h \
+	kcore.h \
+	leds.h limits.h lock.h \
+	math.h mon.h \
+	param.h pcb.h pmap.h promlib.h \
+	proc.h profile.h psl.h pte.h ptrace.h \
+	reg.h \
+	setjmp.h signal.h stdarg.h \
+	trap.h types.h \
+	varargs.h vmparam.h \
+	z8530var.h
+
+.include <bsd.kinc.mk>