Remove generated parsers' dependency on runtime.h

src/runtime/length.h

@@ -1,9 +1,16 @@
 #ifndef RUNTIME_LENGTH_H_
 #define RUNTIME_LENGTH_H_
 
-#include "tree_sitter/parser.h"
+#include <stdlib.h>
 #include <stdbool.h>
 
+typedef struct {
+  size_t bytes;
+  size_t chars;
+  size_t rows;
+  size_t columns;
+} TSLength;
+
 static inline bool ts_length_is_unknown(TSLength self) {
   return self.chars > 0 && self.bytes == 0;
 }