Improved error handling for struct types

lib/sys/time_linux.q

@@ -1,3 +1,8 @@
-nanosleep(duration Pointer) -> Int {
+struct timespec {
+	seconds Int
+	nanoseconds Int
+}
+
+nanosleep(duration *timespec) -> Int {
 	return syscall(35, duration, 0)
 }