mescc: Tinycc support: free stub.

* mlibc/include/stdlib.h (free): Declare.
* mlibc/libc-mes+tcc.c (free): Add stub.

mlibc/include/stdlib.h

@@ -35,6 +35,7 @@ typedef long size_t;
 
 int atoi (char const *s);
 void exit (int);
+void free (void *ptr);
 char* getenv (char const* s);
 void *malloc (size_t);
 void qsort (void *base, size_t nmemb, size_t size, int (*compar)(void const *, void const *));

mlibc/libc-mes+tcc.c

@@ -83,6 +83,11 @@ fprintf (FILE *stream, char const *format, ...)
   return 0;
 }
 
+void
+free (void *ptr)
+{
+}
+
 size_t
 fwrite (void const *ptr, size_t size, size_t nmemb, FILE *stream)
 {