Add another "magic" mark to figure out FAT data.

Yeah, I know it's lie, but this code has been created before
understanding FAT format so it's needs to be updated with
FAT knowledge.

common.h

@@ -22,6 +22,7 @@
 #define FAT_MAGIC_1 0xEB3C9000u
 #define FAT_MAGIC_2 0xEB3E9000u
 #define FAT_MAGIC_3 0xEB3F9000u
+#define FAT_MAGIC_4 0xEB1E9000u
 #define GOTEK_MAX_FDDS 1000u
 
 #define NONNULLARGS __attribute__((nonnull)) 

main.c

@@ -31,6 +31,7 @@ static enum RET_CODES parse_fat(const int fd)
 		((magic_mark & 0xFFFFFF00u) != FAT_MAGIC_1)
 		&& ((magic_mark & 0xFFFFFF00u) != FAT_MAGIC_2)
 		&& ((magic_mark & 0xFFFFFF00u) != FAT_MAGIC_3)
+		&& ((magic_mark & 0xFFFFFF00u) != FAT_MAGIC_4)
 	) {
 		printf("'NO FAT MAGIC FOUND'");
 		return FAIL_FAIL;