udev-rules.c: change import property buffer to 16384 bytes

import_program_into_properties() should have the same line length as
import_file_into_properties()

see also https://bugzilla.redhat.com/show_bug.cgi?id=652318

udev/udev-rules.c

@@ -751,7 +751,7 @@ static int import_program_into_properties(struct udev_device *dev, const char *p
 {
 	struct udev *udev = udev_device_get_udev(dev);
 	char **envp;
-	char result[4096];
+	char result[UTIL_LINE_SIZE];
 	size_t reslen;
 	char *line;