regnual: remove duplicate type declaration.

regnual/regnual.c

@@ -32,8 +32,6 @@
 #include "usb_lld.h"
 #include "sys.h"
 
-extern void *memset (void *s, int c, size_t n);
-
 extern void set_led (int);
 extern int flash_write (uint32_t dst_addr, const uint8_t *src, size_t len);
 extern int flash_protect (void);

regnual/types.h

@@ -1,5 +1,3 @@
-typedef unsigned long size_t;
-
 typedef unsigned char uint8_t;
 typedef unsigned short uint16_t;
 typedef unsigned int uint32_t;
@@ -7,5 +5,3 @@ typedef unsigned int uintptr_t;
 
 #define TRUE  1
 #define FALSE 0
-
-#define NULL  0