Makefile: package config.def.h on make dist

Makefile

@@ -39,8 +39,9 @@ clean:
 dist: clean
 	@echo creating dist tarball
 	@mkdir -p dmenu-${VERSION}
-	@cp LICENSE Makefile README arg.h config.mk dmenu.1 drw.h util.h \
-		dmenu_path dmenu_run stest.1 ${SRC} dmenu-${VERSION}
+	@cp LICENSE Makefile README arg.h config.def.h config.mk dmenu.1 \
+		drw.h util.h dmenu_path dmenu_run stest.1 ${SRC} \
+		dmenu-${VERSION}
 	@tar -cf dmenu-${VERSION}.tar dmenu-${VERSION}
 	@gzip dmenu-${VERSION}.tar
 	@rm -rf dmenu-${VERSION}