variuos: add missing includes

src/shared/calendarspec.c

@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/mman.h>
+#include <unistd.h>
 
 #include "alloc-util.h"
 #include "calendarspec.h"

src/shared/mkfs-util.c

@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include <unistd.h>
+
 #include "id128-util.h"
 #include "mkfs-util.h"
 #include "path-util.h"