backupfile, backup-rename: Trim dependencies

[Bruno Haible]

The module 'backupfile' has a couple of unneeded dependencies. This patch
fixes it.


2021-04-04  Bruno Haible  <bruno@clisp.org>

        backupfile, backup-rename: Trim dependencies.
        * lib/backupfile.h: Add comment.
        * lib/backupfile.c: Include <dirent.h>, for readdir() declaration.
        * modules/backup-rename (Depends-on): Remove dirent-safer, fcntl. Add
        fcntl-h.
        * modules/backupfile (Depends-on): Likewise. Remove xalloc. Add
        xalloc-die.

diff --git a/lib/backupfile.c b/lib/backupfile.c
index 4cef0fc..c53e3f3 100644
--- a/lib/backupfile.c
+++ b/lib/backupfile.c
@@ -22,6 +22,7 @@
 
 #include "backup-internal.h"
 
+#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdbool.h>
diff --git a/lib/backupfile.h b/lib/backupfile.h
index 2a05995..3494770 100644
--- a/lib/backupfile.h
+++ b/lib/backupfile.h
@@ -19,6 +19,7 @@
 #ifndef BACKUPFILE_H_
 #define BACKUPFILE_H_
 
+/* Get AT_FDCWD, as a convenience for users of this file.  */
 #include <fcntl.h>
 
 #ifdef __cplusplus
diff --git a/modules/backup-rename b/modules/backup-rename
index d4bd339..4497b33 100644
--- a/modules/backup-rename
+++ b/modules/backup-rename
@@ -15,8 +15,7 @@ basename-lgpl
 c99
 closedir
 d-ino
-dirent-safer
-fcntl
+fcntl-h
 idx
 memcmp
 opendirat
diff --git a/modules/backupfile b/modules/backupfile
index fd15ec5..41cf99b 100644
--- a/modules/backupfile
+++ b/modules/backupfile
@@ -15,8 +15,7 @@ basename-lgpl
 c99
 closedir
 d-ino
-dirent-safer
-fcntl
+fcntl-h
 idx
 memcmp
 opendirat
@@ -24,7 +23,7 @@ readdir
 renameatu
 stdbool
 stdint
-xalloc
+xalloc-die
 xalloc-oversized
 
 configure.ac: