If syslog-ng.conf has been customised by the user, do not remove it

during pkg_deinstall.

sysutils/syslog-ng3/Makefile

@@ -7,6 +7,7 @@
 
 PORTNAME=	syslog-ng
 PORTVERSION=	3.2.1
+PORTREVISION=	1
 CATEGORIES=	sysutils
 MASTER_SITES=	http://www.balabit.com/downloads/files/syslog-ng/sources/$(PORTVERSION)/source/
 PKGNAMESUFFIX=	3

sysutils/syslog-ng3/pkg-plist

@@ -1,7 +1,7 @@
 @unexec %D/etc/rc.d/syslog-ng.sh stop > /dev/null 2>&1 || true
 etc/modules.conf
 etc/scl.conf
-etc/syslog-ng.conf
+@unexec if cmp -s %D/etc/syslog-ng.conf %D/etc/syslog-ng.conf.sample; then rm -f %D/etc/syslog-ng.conf; fi
 etc/syslog-ng.conf.sample
 bin/update-patterndb
 bin/loggen