util-lib: move more file I/O related calls into fileio.[ch]
diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index 57cca17..85a2d6c 100644
--- a/src/tmpfiles/tmpfiles.c
+++ b/src/tmpfiles/tmpfiles.c
@@ -45,6 +45,7 @@
 #include "copy.h"
 #include "escape.h"
 #include "fd-util.h"
+#include "fileio.h"
 #include "formats-util.h"
 #include "io-util.h"
 #include "label.h"