symlinkat: new module
* modules/symlinkat: New file.
* lib/symlinkat.c: Likewise.
* m4/symlinkat.m4 (gl_FUNC_SYMLINKAT): Likewise.
* m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Add witnesses.
* modules/unistd (Makefile.am): Use them.
* lib/unistd.in.h (symlinkat, readlinkat): Declare them.
(faccessat) [GNULIB_POSIXCHECK]: Fix typo.
* lib/at-func.c (FUNC_RESULT): New macro, defaulting to int.
* MODULES.html.sh (File system functions): Mention module.
* doc/posix-functions/symlinkat.texi (symlinkat): Likewise.
* doc/posix-functions/readlinkat.texi (readlinkat): Likewise.
* modules/symlinkat-tests: New test.
* tests/test-symlinkat.c: Likewise.
Signed-off-by: Eric Blake <ebb9@byu.net>
13 files changed: