Introduce prototypes for scandir, scandirat.  This was implemented

upstream in:

commit d2ee815ad677bba720c4f0275c1d6065f5809e7a

Author: Roland McGrath <roland@hack.frob.com>

Date:   Wed May 13 12:34:11 2015 -0700

    Refactor scandir/scandirat to use common tail.

Not backported here because of its dependency on the fix for

swbz#17999.

diff --git a/dirent/scandir.c b/dirent/scandir.c

index 6dce54d64a3effa2..39c4c20e2b22804d 100644

--- a/dirent/scandir.c

+++ b/dirent/scandir.c

@@ -34,11 +34,9 @@

 int

-SCANDIR (dir, namelist, select, cmp)

-     const char *dir;

-     DIRENT_TYPE ***namelist;

-     int (*select) (const DIRENT_TYPE *);

-     int (*cmp) (const DIRENT_TYPE **, const DIRENT_TYPE **);

+SCANDIR (const char *dir, DIRENT_TYPE ***namelist,

+         int (*select) (const DIRENT_TYPE *),

+         int (*cmp) (const DIRENT_TYPE **, const DIRENT_TYPE **))

 {

   return SCANDIRAT (AT_FDCWD, dir, namelist, select, cmp);

 }

diff --git a/dirent/scandirat.c b/dirent/scandirat.c

index c2704baa88ef71d0..0200171a64139933 100644

--- a/dirent/scandirat.c

+++ b/dirent/scandirat.c

@@ -52,12 +52,9 @@ __scandir_cancel_handler (void *arg)

 int

-SCANDIRAT (dfd, dir, namelist, select, cmp)

-     int dfd;

-     const char *dir;

-     DIRENT_TYPE ***namelist;

-     int (*select) (const DIRENT_TYPE *);

-     int (*cmp) (const DIRENT_TYPE **, const DIRENT_TYPE **);

+SCANDIRAT (int dfd, const char *dir, DIRENT_TYPE ***namelist,

+	   int (*select) (const DIRENT_TYPE *),

+	   int (*cmp) (const DIRENT_TYPE **, const DIRENT_TYPE **))

 {

   DIR *dp = __opendirat (dfd, dir);

   DIRENT_TYPE **v = NULL;