CHANGES: add #593

Issue #593 got (unknowingly) fixed by 7f7bf9637e2a9c3.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
diff --git a/CHANGES b/CHANGES
index 0b82254..d6b7c03 100644
--- a/CHANGES
+++ b/CHANGES
@@ -24,6 +24,7 @@
 	#527: misc fixes for dnsmasq package
 	#565: libevent: Bump version and clean up makefile
 	#587: Use iptables multipurpose binaries and bump to 1.4.4
+	#593: Missing early check for patch(1)
 	#609: libmicrohttpd: New package
 	#615: python: Don't delete .py files unless asked
 	#617: netkit/inetd requires RPC and fails to build if RPC is disabled