Make all header files self-suffienct

Almost all the headers in cryptsetup are self-suffienct (in that they
compile on their own). By including <stddef.h>, <stdint.h>, or
<sys/types.h>, all headers will now compile on their own.

This is useful for importing cryptsetup into Bazel/Blaze.

lib/loopaes/loopaes.h

@@ -22,6 +22,7 @@
 #ifndef _LOOPAES_H
 #define _LOOPAES_H
 
+#include <stdint.h>
 #include <unistd.h>
 
 struct crypt_device;

lib/luks1/af.h

@@ -24,6 +24,8 @@
 #ifndef INCLUDED_CRYPTSETUP_LUKS_AF_H
 #define INCLUDED_CRYPTSETUP_LUKS_AF_H
 
+#include <stddef.h>
+
 /*
  * AF_split operates on src and produces information split data in
  * dst. src is assumed to be of the length blocksize. The data stripe

lib/utils_io.h

@@ -24,6 +24,8 @@
 #ifndef _CRYPTSETUP_UTILS_IO_H
 #define _CRYPTSETUP_UTILS_IO_H
 
+#include <sys/types.h>
+
 ssize_t read_buffer(int fd, void *buf, size_t length);
 ssize_t write_buffer(int fd, const void *buf, size_t length);
 ssize_t write_blockwise(int fd, size_t bsize, size_t alignment,

lib/utils_keyring.h

@@ -22,6 +22,8 @@
 #ifndef _UTILS_KEYRING
 #define _UTILS_KEYRING
 
+#include <stddef.h>
+
 int keyring_check(void);
 
 int keyring_get_passphrase(const char *key_desc,

lib/verity/verity.h

@@ -21,6 +21,7 @@
 #ifndef _VERITY_H
 #define _VERITY_H
 
+#include <stddef.h>
 #include <stdint.h>
 
 #define VERITY_MAX_HASH_TYPE 1