Fix some modules' file list.

* modules/fstatat (Files): Add m4/lstat.m4.
* modules/openat (Files): Likewise.
* modules/unlinkat (Files): Likewise.
gitlog-to-changelog: support multi-author commits.

The FSF cares about keeping track of all authors of patches to its
projects, but Git doesn't provide obvious support for multi-author
changesets. Consensus seems to be forming around the use of extra
Signed-off-by inspired lines in the log message formatted as
`Co-authored-by: A U Thor <email@example.com>' for round-tripping
multi-author commits between version control systems.
* gitlog-to-changelog: Extract `Co-authored-by:' lines from the git
log message and output in standard ChangeLog multi-author format.
Reported by Peter Rosin <peda@lysator.liu.se>
test-getcwd: don't leave behind a confdir3/ directory upon interrupt

Invoke the test program via an init.sh-using wrapper.
* tests/test-getcwd.sh: New file.
* modules/getcwd-tests (Files): Add it.
(Makefile.am) [TESTS]: Invoke the shell script wrapper.
tests: factor out st_ctime-comparison code (a dozen uses)

* tests/test-utimens-common.h (ctime_compare): Define.
* tests/test-futimens.h (test_futimens): Replace open-coded equivalent.
* tests/test-lutimens.h (test_lutimens): Likewise.
* tests/test-utimens.h (test_utimens): Likewise.
modules/crypto/gc-*: simplify dependencies and fix stdalign.h bug

stdalign problem reported by Ian Beckwith in
<http://lists.gnu.org/archive/html/bug-gnulib/2011-11/msg00238.html>.
* modules/crypto/gc-arcfour (Depends-on):
Depend conditionally on crypto/arcfour.
* modules/crypto/gc-arctwo (Depends-on):
Depend conditionally on crypto/arctwo.
* modules/crypto/gc-des (Depends-on):
Depend conditionally on crypto/des.
* modules/crypto/gc-hmac-md5 (Depends-on):
Depend conditionally on crypto/hmac-md5.
* modules/crypto/gc-hmac-sha1 (Depends-on):
Depend conditionally on crypto/hmac-sha1.
* modules/crypto/gc-md2 (Depends-on): Remove stdint, minmax.
* modules/crypto/gc-md4 (Depends-on):
Depend conditionally on crypto/md4.
* modules/crypto/gc-md5 (Depends-on):
Depend conditionally on crypto/md5.
* modules/crypto/gc-rijndael (Depends-on):
Depend conditionally on crypto/rijndael.
* modules/crypto/gc-sha1 (Depends-on):
Depend conditionally on crypto/sha1.
* modules/crypto/gc-arcfour:
* modules/crypto/gc-arctwo:
* modules/crypto/gc-des:
* modules/crypto/gc-hmac-md5:
* modules/crypto/gc-hmac-sha1:
* modules/crypto/gc-md2:
* modules/crypto/gc-md4:
* modules/crypto/gc-md5:
* modules/crypto/gc-rijndael:
* modules/crypto/gc-sha1:
(Files, Depends-on, configure.ac): Remove now-unnecessary stuff,
now that the conditional dependencies do the work for us.
* modules/getcwd (Depends-on): Add fdopendir.

This fixes one of the two problems reported by Kai Habel in
<http://lists.gnu.org/archive/html/bug-gnulib/2011-11/msg00237.html>.
openat: avoid compilation failure due to lack of <errno.h> inclusion

* lib/openat.c: Include <errno.h>.
hash: deprecate poorly-named hash_insert0: use hash_insert_if_absent

* lib/hash.c (hash_insert_if_absent): Rename from hash_insert0.
Add a sentence to the comment.
(hash_insert0): New function that simply calls hash_insert_if_absent.
* lib/hash.h (hash_insert_if_absent): Declare it.
(hash_insert0): Add deprecation attribute.
(_GL_ATTRIBUTE_DEPRECATED): Define.
* lib/di-set.c (di_set_insert): Use hash_insert_if_absent,
not hash_insert0.
* NEWS: Mention it, even though it's not really an incompatible change
Prompted by a question from Matthew Booth <mbooth@redhat.com>.
fstatat: fix configuration bug on mingw, OpenBSD 4, Solaris 8

* lib/fstatat.c (AT_FUNC_NAME): Use HAVE_FSTAT, not
HAVE_WORKING_FSTATAT_ZERO_FLAG, to decide whether to define
rpl_fstatat or fstatat.  This should fix the other problem
reported by Kai Habel in
<http://lists.gnu.org/archive/html/bug-gnulib/2011-11/msg00237.html>.
A similar problem was reported for OpenBSD 4.6 by Mats Erik Andersson
<http://lists.gnu.org/archive/html/bug-gnulib/2011-11/msg00239.html>
and I reproduced it on a Solaris 8 host we still have in production.
test-getcwd: disambiguate exit status

* tests/test-getcwd.c (test_long_name): Return 0..7.
(main): Exit with an unambiguous exit status.  The old
code yielded a mysterious mixture of two failure codes.
readline: Check for readline/history.h.

* m4/readline.m4 (gl_FUNC_READLINE): Check for readline/history.h.
hash: Don't refer to deprecated interfaces.

* lib/hash.c (hash_insert): Use hash_insert_if_absent,
not hash_insert0.
(hash_insert_if_absent): Doc fix.
Ensure 'inline' can be used in tests/test-utimens-common.h.

* modules/fdutimensat-tests (configure.ac): Require AC_C_INLINE.
* modules/futimens-tests (configure.ac): Likewise.
* modules/utimens-tests (configure.ac): Likewise.
* modules/utimensat-tests (configure.ac): Likewise.
fstatat: Simplify.

* lib/fstatat.c (AT_FUNC_NAME): Define as fstatat. On platforms where
gnulib should define rpl_fstatat, there is a
"#define fstatat rpl_fstatat" in <sys/stat.h>.
openat: Fix file list.

* modules/openat (Files): Remove lib/at-func.c.
euidaccess: Update a comment.

* lib/euidaccess.c: Update comment about platforms with faccessat.
Depend on module fcntl-h when AT_FDCWD is used.

* modules/utimens (Depends-on): Add fcntl-h.
* modules/areadlinkat (Depends-on): Likewise.
* modules/areadlinkat-with-size (Depends-on): Likewise.
* modules/faccessat (Depends-on): Likewise.
* modules/fchmodat (Depends-on): Likewise.
* modules/fchownat (Depends-on): Likewise.
* modules/getcwd (Depends-on): Likewise.
* modules/mkdirat (Depends-on): Likewise.
* modules/mkfifoat (Depends-on): Likewise.
* modules/readlinkat (Depends-on): Likewise.
* modules/symlinkat (Depends-on): Likewise.
* modules/dup2-tests (Depends-on): Likewise.
* modules/fdutimensat-tests (Depends-on): Likewise.
* modules/futimens-tests (Depends-on): Likewise.
sethostname: Mention more portability problems.

* doc/glibc-functions/sethostname.texi: Mention the missing declaration
problem.
Reported by Ben Walton <bwalton@artsci.utoronto.ca>.
sethostname: Fix doc about AIX.

* doc/glibc-functions/sethostname.texi: Drop mention that AIX 5.1 lacks
sethostname; it has it.
fma: Remove unused code.

* lib/fma.c (DECL_ROUNDING, BEGIN_ROUNDING, END_ROUNDING): Remove
unused macros.