tools/kernel2minor: fix portability issue

Signed-off-by: Felix Fietkau <nbd@nbd.name>

tools/kernel2minor/patches/100-portability.patch

+--- a/yaffs2/yaffs_guts.h
++++ b/yaffs2/yaffs_guts.h
+@@ -17,8 +17,9 @@
+ #define __YAFFS_GUTS_H__
+ 
+ #include "yportenv.h"
++#include <stdint.h>
+ 
+-typedef __loff_t loff_t;
++typedef int64_t loff_t;
+ 
+ #define YAFFS_OK	1
+ #define YAFFS_FAIL  0