Fix deprecated 'prog_*' typedef - Issue #34

- Remove prog_char from xpritnf
- Remove prog_macro_t from acton_macro

avr-libc-1.8 removed 'prog_*' typedef because the usage of
the __progmem__ attribute on a type is not supported in GCC.
http://www.nongnu.org/avr-libc/changes-1.8.html

keyboard/hhkb/keymap.c

@@ -209,7 +209,7 @@ static const uint16_t PROGMEM fn_actions[] = {
 /*
  * Macro definition
  */
-const prog_macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
+const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
 {
     keyevent_t event = record->event;
     tap_t tap = record->tap;