scron: /etc/crontab is a configuration file, add it to conf_files.

srcpkgs/scron/template

@@ -1,7 +1,7 @@
 # Template file for 'scron'
 pkgname=scron
 version=0.3.2
-revision=2
+revision=3
 build_style=gnu-makefile
 short_desc="Simple cron daemon"
 maintainer="Ypnose <linuxienATlegtuxDOTorg>"
@@ -11,6 +11,7 @@ distfiles="http://dl.2f30.org/releases/${pkgname}-${version}.tar.gz"
 checksum=10ffdbd3625204a6f73a096125bfdbbda849a394028f25befdf2ac65ed22d111
 replaces="cron-daemon>=0"
 provides="cron-daemon-0_1"
+conf_files="/etc/crontab"
 
 pre_build() {
 	# STFU gcc