put emul sysctls in appropriate arch. also fix up the comments.

problems noted by fgsch@ and deraadt@

src/etc/etc.alpha/sysctl.conf

@@ -2,3 +2,5 @@
 #machdep.unaligned_fix=0	# 0 - disable fixup of unaligned access
 #machdep.unaligned_sigbus=0	# 0 - don't sigbus on unaligned access
 #machdep.allowaperture=1	# see xf86(4)
+#kern.emul.netbsd=1		# enable running NetBSD Elf64 binaries
+#kern.emul.osf1=1		# enable running OSF/1 binaries

src/etc/etc.hp300/sysctl.conf

@@ -0,0 +1,2 @@
+#kern.emul.hpux=1		# enable running HP/UX binaries
+#kern.emul.sunos=1		# enable running SunOS binaries

src/etc/etc.i386/sysctl.conf

@@ -4,3 +4,9 @@
 #machdep.kbdreset=1		# permit console CTRL-ALT-DEL to do a nice halt
 #machdep.userldt=1		# allow userland programs to play with ldt,
 				# required by some ports
+#kern.emul.aout=1		# enable running dynamic OpenBSD a.out bins
+#kern.emul.bsdos=1		# enable running BSD/OS binaries
+#kern.emul.freebsd=1		# enable running FreeBSD binaries
+#kern.emul.ibcs2=1		# enable running iBCS2 binaries
+#kern.emul.linux=1		# enable running Linux binaries
+#kern.emul.svr4=1		# enable running SVR4 binaries

src/etc/etc.mac68k/sysctl.conf

@@ -0,0 +1 @@
+#kern.emul.sunos=1		# enable running SunOS binaries

src/etc/etc.mvme68k/sysctl.conf

@@ -0,0 +1,2 @@
+#kern.emul.hpux=1		# enable running HP/UX binaries
+#kern.emul.sunos=1		# enable running SunOS binaries

src/etc/etc.sparc/sysctl.conf

@@ -1 +1,3 @@
 #machdep.led_blink=1		# 1=On sparc, make led(s) blink
+#kern.emul.sunos=1		# enable running SunOS binaries
+#kern.emul.svr4=1		# enable running SVR4 binaries

src/etc/etc.vax/sysctl.conf

@@ -0,0 +1 @@
+#kern.emul.ultrix=1		# enable running Ultrix binaries

src/etc/sysctl.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: sysctl.conf,v 1.29 2003/08/23 19:33:08 tedu Exp $
+#	$OpenBSD: sysctl.conf,v 1.30 2003/08/24 06:21:56 tedu Exp $
 #
 # This file contains a list of sysctl options the user wants set at
 # boot time.  See sysctl(3) and sysctl(8) for more information on
@@ -20,16 +20,3 @@
 #net.inet.ip.mtudisc=0		# 0=disable tcp mtu discovery
 #kern.usercrypto=1		# 1=enable userland use of /dev/crypto
 #kern.splassert=2		# 2=enable and verbose error messages.
-# Emulations, uncomment to enable
-#kern.emul.aout=1
-#kern.emul.bsdos=1
-#kern.emul.freebsd=1
-#kern.emul.hpux=1
-#kern.emul.ibcs2=1
-#kern.emul.linux=1
-#kern.emul.netbsd=1
-#kern.emul.osf1=1
-#kern.emul.sunos=1
-#kern.emul.svr4=1
-#kern.emul.ultrix=1
-