AP_Progmem: remove unused library

libraries/AP_Progmem/AP_Progmem.h

@@ -1,41 +0,0 @@
-#pragma once
-
-#include <string.h>
-#include <stdint.h>
-
-// read something the size of a byte
-static inline uint8_t pgm_read_byte(const void *s) {
-	return *(const uint8_t *)s;
-}
-
-// read something the size of a byte, far version
-static inline uint8_t pgm_read_byte_far(const void *s) {
-	return *(const uint8_t *)s;
-}
-
-// read something the size of a word
-static inline uint16_t pgm_read_word(const void *s) {
-	return *(const uint16_t *)s;
-}
-
-// read something the size of a dword
-static inline uint32_t pgm_read_dword(const void *s) {
-	return *(const uint32_t *)s;
-}
-
-// read something the size of a float
-static inline float pgm_read_float(const void *s) {
-	return *(const float *)s;
-}
-
-// read something the size of a pointer. This makes the menu code more
-// portable
-static inline uintptr_t pgm_read_pointer(const void *s) {
-	return *(const uintptr_t *)s;
-}
-
-// read something the size of a pointer. This makes the menu code more
-// portable
-static inline void pgm_read_block(const void *s, void *dest, uint8_t len) {
-    memcpy(dest, s, len);
-}