disable leaking TCP timestamps by default

https://github.com/QubesOS/qubes-issues/issues/1344

Makefile

@@ -128,6 +128,7 @@ install-common:
 
 	install -D -m 0440 misc/qubes.sudoers $(DESTDIR)/etc/sudoers.d/qubes
 	install -D -m 0440 misc/sudoers.d_qt_x11_no_mitshm $(DESTDIR)/etc/sudoers.d/qt_x11_no_mitshm
+	install -D -m 0440 misc/20_tcp_timestamps.conf $(DESTDIR)/etc/sysctl.d/20_tcp_timestamps.conf
 
 	install -d $(DESTDIR)/var/lib/qubes
 

misc/20_tcp_timestamps.conf

@@ -0,0 +1 @@
+net.ipv4.tcp_timestamps=0