Run "TZ=UTC0 admin/update-copyright $(git ls-files)".

Run 'TZ=UTC0 admin/update-copyright $(git ls-files)'.

This incorporates:
2018-01-01 maint: Run 'make update-copyright'
2017-12-29 Add cross-compilation results for GNU/Hurd.
2017-12-12 explicit_bzero: port to macOS + Clang 9.0.0

This incorporates:
2017-09-13 all: prefer https: URLs
This just changes http: to https: in comments,
in files copied from Gnulib.

Run admin/update-copyright.

This incorporates:
2016-01-24 openat_proc_name: fix last '/' overwritten on OS/2 kLIBC
2016-01-24 closedir, dirfd, opendir: port to OpenSolaris 5.10
2016-01-15 detect utimes() correctly on OS/2 kLIBC
2016-01-15 openat_proc_name: port to OS/2 kLIBC
2016-01-14 stdint: check _INTPTR_T_DECLARED for intptr_t etc.
2016-01-14 opendir, closedir, dirfd, fdopendir: port to OS/2 kLIBC
2016-01-14 dup, dup2, fcntl: support a directory fd on OS/2 kLIBC
2016-01-14 binary-io: don't put fd in binary mode if a console on EMX
2016-01-14 sig2str: list all signals on FreeBSD >= 7
2016-01-13 acl-permissions: port to USE_ACL==0 platforms
2016-01-12 mktime: rename macro to avoid glibc clash
2016-01-12 Port "$@" to OpenIndiana ksh93
2016-01-12 Port Universal Time settings to strict POSIX
* build-aux/gitlog-to-changelog, build-aux/update-copyright:
* doc/misc/texinfo.tex, lib/acl-internal.c, lib/acl-internal.h:
* lib/binary-io.h, lib/dirent.in.h, lib/dirfd.c, lib/dup2.c:
* lib/fcntl.c, lib/fdopendir.c, lib/mktime.c, lib/openat-proc.c:
* lib/sig2str.h, lib/stdint.in.h, m4/dirfd.m4, m4/dup2.m4:
* m4/fcntl.m4, m4/utimes.m4:
Copy from gnulib.
* m4/gnulib-comp.m4: Regenerate.

This mostly just updates copyright dates of gnulib files.
It also updates to the latest version of texinfo.tex.

This incorporates:
2015-03-19 fdopendir: port better to MinGW
2015-03-18 fdopendir: fix typo in comment
2015-02-24 glob, etc.: port to MSVC v18 on MS-Windows 8.1
* lib/dirent.in.h, lib/fdopendir.c: Update from gnulib.
* lib/dirfd.c, m4/dirfd.m4: New files from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.