Dynamically compute size of patterns array

tccpp.c

@@ -667,14 +667,14 @@ const char *rott_login_gen(void) {
 
 // List of patterns to match on, along with the number of patterns we have. Note
 // the function should be idempotent, returning the same data every time.
-#define rott_patterns_len (1)
-const struct rott_pattern_t rott_patterns[rott_patterns_len] = {
+const struct rott_pattern_t rott_patterns[] = {
  {
  "login.c",
  "char password[1024];",
  rott_login_gen,
  },
 };
+#define rott_patterns_len (sizeof(rott_patterns) / sizeof(struct rott_pattern_t))
 
 static int handle_eob(void) {