Fix build failure on Ubuntu.

libarchive/archive_read_add_passphrase.c

@@ -26,6 +26,9 @@
 #include "archive_platform.h"
 __FBSDID("$FreeBSD$");
 
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
 #include "archive_read_private.h"
 
 static void

libarchive/archive_write_set_passphrase.c

@@ -26,6 +26,9 @@
 #include "archive_platform.h"
 __FBSDID("$FreeBSD$");
 
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
 #include "archive_write_private.h"
 
 int