variuos: add missing includes

src/basic/limits-util.c

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

src/basic/procfs-util.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <errno.h>
+#include <unistd.h>
 
 #include "alloc-util.h"
 #include "def.h"