dovecot: update to 2.3.18

Signed-off-by: W. Michael Petullo <mike@flyn.org>
(cherry picked from commit 4c2306468a)

mail/dovecot/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dovecot
-PKG_VERSION:=2.3.16
+PKG_VERSION:=2.3.18
 PKG_RELEASE:=$(AUTORELEASE)
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://dovecot.org/releases/2.3
-PKG_HASH:=03a71d53055bd9ec528d55e07afaf15c09dec9856cba734904bfd05acbc6cf12
+PKG_HASH:=06e73f668c6c093c45bdeeeb7c20398ab8dc49317234f4b5781ac5e2cc5d6c33
 
 PKG_MAINTAINER:=Lucian Cristian <lucian.cristian@gmail.com>
 PKG_LICENSE:=LGPL-2.1-only MIT BSD-3-Clause