Minor tweak

repl/lib_runner.c

@@ -7,6 +7,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 typedef struct Toy_Runner {
 	Toy_Interpreter interpreter;

repl/lib_standard.c

@@ -2,9 +2,10 @@
 
 #include "toy_memory.h"
 
-#include <ctype.h>
 #include <stdio.h>
+#include <string.h>
 #include <time.h>
+#include <ctype.h>
 
 static int nativeClock(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments) {
 	//no arguments