pic16bit: Use 1 byte for qstr hash len and include header to fix build.

Signed-off-by: Damien George <damien@micropython.org>

ports/pic16bit/main.c

@@ -29,6 +29,7 @@
 #include <string.h>
 #include <p33Fxxxx.h>
 
+#include "py/builtin.h"
 #include "py/compile.h"
 #include "py/runtime.h"
 #include "py/gc.h"

ports/pic16bit/mpconfigport.h

@@ -29,6 +29,7 @@
 // options to control how MicroPython is built
 #define MICROPY_OBJ_REPR            (MICROPY_OBJ_REPR_B)
 #define MICROPY_ALLOC_PATH_MAX      (64)
+#define MICROPY_QSTR_BYTES_IN_HASH  (1)
 #define MICROPY_EMIT_X64            (0)
 #define MICROPY_EMIT_THUMB          (0)
 #define MICROPY_EMIT_INLINE_THUMB   (0)