New modules 'at-internal', 'openat-h', split off from module 'openat'. * m4/openat.m4 (gl_FUNC_OPENAT): Don't set GNULIB_OPENAT. Don't invoke gl_PREREQ_OPENAT and gl_MODULE_INDICATOR. * modules/openat (Description): Add reference to POSIX function. (Files): Remove lib/openat.h, lib/openat-proc.c. (Depends-on): Add at-internal, openat-h. Remove fdopendir, gettext-h, intprops, unistd. (configure.ac): Remove AC_LIBOBJ of openat-proc. Invoke gl_PREREQ_OPENAT, gl_MODULE_INDICATOR here. Invoke gl_FCNTL_MODULE_INDICATOR. (Include): Remove unistd.h, openat.h. * modules/areadlinkat (Files): Add lib/at-func.c. (Depends-on): Add at-internal, dosname, errno, extensions, fchdir, openat-die, openat-h, save-cwd. * modules/areadlinkat-with-size (Files): Add lib/at-func.c. (Depends-on): Add at-internal, dosname, errno, extensions, fchdir, openat-die, openat-h, save-cwd, unistd. * modules/faccessat (Files): Add lib/at-func.c, lib/openat-priv.h. (Depends-on): Add at-internal, dosname, errno, fchdir, openat-die, openat-h, save-cwd. Remove fcntl-h, openat. * modules/fchmodat (Files): Remove lib/openat.h. (Depends-on): Add at-internal, openat-h. Remove dirent, fcntl-h, openat, stdbool, unistd. * modules/fchownat (Files): Remove lib/openat.h. (Depends-on): Add at-internal, openat-h. Remove dirent, fcntl-h, openat, stdbool, sys_stat. * modules/fdopendir (Files): Remove lib/openat-priv.h, lib/openat-proc.c. (Depends-on): Add at-internal. (condigure.ac): Remove AC_LIBOBJ of openat-proc. * modules/fstatat (Files): Remove lib/openat.h. (Depends-on): Add at-internal, openat-h. Remove dirent, openat, stdbool, unistd. * modules/fts (Depends-on): Add openat-h. * modules/linkat (Depends-on): Add at-internal, openat-h. Remove openat. * modules/mkdirat (Files): Remove lib/openat.h. (Depends-on): Add at-internal, openat-h. Remove dirent, fcntl-h, openat, stdbool, sys_stat. * modules/mkfifoat (Files): Add lib/at-func.c. (Depends-on): Add at-internal, dosname, errno, fchdir, openat-die, openat-h, save-cwd. Remove fcntl-h, openat. * modules/openat-die (Depends-on): Add openat-h. Remove openat. * modules/readlinkat (Files): Add lib/at-func.c. (Depends-on): Add at-internal, dosname, errno, fchdir, openat-die, openat-h, save-cwd. Remove fcntl-h, openat. * modules/renameat (Depends-on): Add at-internal, openat-h. Remove openat. * modules/selinux-at (Files): Add lib/at-func.c. (Depends-on): Add at-internal, dosname, errno, extensions, fchdir, fcntl-h, openat-die, openat-h, save-cwd, unistd. Remove openat. * modules/symlinkat (Files): Add lib/at-func.c. (Depends-on): Add at-internal, dosname, errno, fchdir, openat-die, openat-h, save-cwd. Remove fcntl-h, openat. * modules/unlinkat (Files): Remove lib/openat.h. (Depends-on): Add at-internal, openat-h. Remove dirent, openat, stdbool. * modules/utimensat (Files): Add lib/at-func.c. (Depends-on): Add at-internal, dosname, errno, fchdir, fcntl-h, openat-die, openat-h, save-cwd. * modules/fchownat-tests (Depends-on): Add openat-h. Remove openat. * modules/fdutimensat-tests (Depends-on): Add openat. * modules/fstatat-tests (Depends-on): Add openat-h. * modules/readlinkat-tests (Depends-on): Add openat. * modules/symlinkat-tests (Depends-on): Add openat.