bogofilter: mark /etc/bogofilter.cf as a configuration file

Signed-off-by: W. Michael Petullo <mike@flyn.org>

mail/bogofilter/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=bogofilter
 PKG_VERSION:=1.2.4
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_LICENSE:=GPLv2
 PKG_LICENSE_FILES:=COPYING
@@ -40,6 +40,10 @@ CONFIGURE_ARGS += \
 	--with-libdb-prefix=$(STAGING_DIR) \
 	--with-included-gsl
 
+define Package/bogofilter/conffiles
+/etc/bogofilter.cf
+endef
+
 define Package/bogofilter/install
 	$(INSTALL_DIR)  $(1)/etc/ \
                         $(1)/usr/bin \