stop "advertising" disabling pmtud and window size increasing

very rarely if ever needed any more. we should not trick people into
thinking they are impoving sth doing so, it's rather the opposite
these days.
ok claudio

src/etc/sysctl.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: sysctl.conf,v 1.54 2012/09/20 12:51:43 yasuoka Exp $
+#	$OpenBSD: sysctl.conf,v 1.55 2014/04/19 16:49:13 henning 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
@@ -15,8 +15,6 @@
 #net.inet6.ip6.accept_rtadv=1	# 1=Permit IPv6 autoconf (forwarding must be 0)
 #net.inet.tcp.always_keepalive=1 # 1=Keepalives for all connections (e.g. hotel/airport NAT)
 #net.inet.tcp.keepidle=100	# 100=send TCP keepalives every 50 seconds
-#net.inet.tcp.rfc1323=0		# 0=Disable TCP RFC1323 extensions (for if tcp is slow)
-#net.inet.tcp.rfc3390=0		# 0=Disable RFC3390 for TCP window increasing
 #net.inet.esp.enable=0		# 0=Disable the ESP IPsec protocol
 #net.inet.ah.enable=0		# 0=Disable the AH IPsec protocol
 #net.inet.esp.udpencap=0	# 0=Disable ESP-in-UDP encapsulation