Update Gnulib to the latest git version

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/* System definitions for code taken from the GNU C Library

   Copyright 2017-2019 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public
   License along with this program; if not, see
   <https://www.gnu.org/licenses/>.  */

/* Written by Paul Eggert.  */

/* This is intended to be a good-enough substitute for glibc system
   macros like those defined in <sys/cdefs.h>, so that Gnulib code
   shared with glibc can do this as the first #include:

     #ifndef _LIBC
     # include <libc-config.h>
     #endif

   When compiled as part of glibc this is a no-op; when compiled as
   part of Gnulib this includes Gnulib's <config.h> and defines macros
   that glibc library code would normally assume.  */

#include <config.h>

/* On glibc this includes <features.h> and <sys/cdefs.h> and #defines
   _FEATURES_H, __WORDSIZE, and __set_errno.  On FreeBSD 11 it
   includes <sys/cdefs.h> which defines __nonnull.  Elsewhere it
   is harmless.  */
#include <errno.h>

/* From glibc <errno.h>.  */
#ifndef __set_errno
# define __set_errno(val) (errno = (val))
#endif

/* From glibc <features.h>.  */

#ifndef __GNUC_PREREQ
# if defined __GNUC__ && defined __GNUC_MINOR__
#  define __GNUC_PREREQ(maj, min) ((maj) < __GNUC__ + ((min) <= __GNUC_MINOR__))
# else
#  define __GNUC_PREREQ(maj, min) 0
# endif
#endif

#ifndef __glibc_clang_prereq
# if defined __clang_major__ && defined __clang_minor__
#  define __glibc_clang_prereq(maj, min) \
     ((maj) < __clang_major__ + ((min) <= __clang_minor__))
# else
#  define __glibc_clang_prereq(maj, min) 0
# endif
#endif


/* Prepare to include <cdefs.h>, which is our copy of glibc
   <sys/cdefs.h>.  */

/* Define _FEATURES_H so that <cdefs.h> does not include <features.h>.  */
#ifndef _FEATURES_H
# define _FEATURES_H 1
#endif
/* Define __WORDSIZE so that <cdefs.h> does not attempt to include
   nonexistent files.  Make it a syntax error, since Gnulib does not
   use __WORDSIZE now, and if Gnulib uses it later the syntax error
   will let us know that __WORDSIZE needs configuring.  */
#ifndef __WORDSIZE
# define __WORDSIZE %%%
#endif
/* Undef the macros unconditionally defined by our copy of glibc
   <sys/cdefs.h>, so that they do not clash with any system-defined
   versions.  */
#undef _SYS_CDEFS_H
#undef __ASMNAME
#undef __ASMNAME2
#undef __BEGIN_DECLS
#undef __CONCAT
#undef __END_DECLS
#undef __HAVE_GENERIC_SELECTION
#undef __LDBL_COMPAT
#undef __LDBL_REDIR
#undef __LDBL_REDIR1
#undef __LDBL_REDIR1_DECL
#undef __LDBL_REDIR1_NTH
#undef __LDBL_REDIR_DECL
#undef __LDBL_REDIR_NTH
#undef __LEAF
#undef __LEAF_ATTR
#undef __NTH
#undef __NTHNL
#undef __P
#undef __PMT
#undef __REDIRECT
#undef __REDIRECT_LDBL
#undef __REDIRECT_NTH
#undef __REDIRECT_NTHNL
#undef __REDIRECT_NTH_LDBL
#undef __STRING
#undef __THROW
#undef __THROWNL
#undef __always_inline
#undef __attribute__
#undef __attribute_alloc_size__
#undef __attribute_artificial__
#undef __attribute_const__
#undef __attribute_deprecated__
#undef __attribute_deprecated_msg__
#undef __attribute_format_arg__
#undef __attribute_format_strfmon__
#undef __attribute_malloc__
#undef __attribute_noinline__
#undef __attribute_nonstring__
#undef __attribute_pure__
#undef __attribute_used__
#undef __attribute_warn_unused_result__
#undef __bos
#undef __bos0
#undef __errordecl
#undef __extension__
#undef __extern_always_inline
#undef __extern_inline
#undef __flexarr
#undef __fortify_function
#undef __glibc_c99_flexarr_available
#undef __glibc_clang_has_extension
#undef __glibc_likely
#undef __glibc_macro_warning
#undef __glibc_macro_warning1
#undef __glibc_unlikely
#undef __inline
#undef __ptr_t
#undef __restrict
#undef __restrict_arr
#undef __va_arg_pack
#undef __va_arg_pack_len
#undef __warnattr
#undef __warndecl

/* Include our copy of glibc <sys/cdefs.h>.  */
#include <cdefs.h>

/* <cdefs.h> __inline is too pessimistic for non-GCC.  */
#undef __inline
#ifndef HAVE___INLINE
# if 199901 <= __STDC_VERSION__ || defined inline
#  define __inline inline
# else
#  define __inline
# endif
#endif


/* A substitute for glibc <libc-symbols.h>, good enough for Gnulib.  */
#define attribute_hidden
#define libc_hidden_proto(name, ...)
#define libc_hidden_def(name)
#define libc_hidden_weak(name)
#define libc_hidden_ver(local, name)
#define strong_alias(name, aliasname)
#define weak_alias(name, aliasname)

/* A substitute for glibc <shlib-compat.h>, good enough for Gnulib.  */
#define SHLIB_COMPAT(lib, introduced, obsoleted) 0
#define versioned_symbol(lib, local, symbol, version)