This incorporates:
2017-10-02 fsusage: fix typo in previous change
* lib/fsusage.c: Copy from Gnulib.

* admin/merge-gnulib (GNULIB_MODULES): Add fsusage.
* doc/emacs/files.texi (Directories): Remove documentation of
now-obsolete directory-free-space-program and
directory-free-space-args.
* etc/NEWS: Mention change.
* etc/PROBLEMS: Slow df is no longer a problem.
* lib/fsusage.c, lib/fsusage.h, m4/fsusage.m4:
New files, copied from Gnulib.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
* lisp/dired.el (dired-free-space-program)
(dired-free-space-args): These aliases are now obsolete.
* lisp/files.el (directory-free-space-program)
(directory-free-space-args): Now obsolete.
(get-free-disk-space): Just call file-system-info instead
of the now-obsolete directory-free-space-program.
* nt/gnulib-cfg.mk (OMIT_GNULIB_MODULE_fsusage): New macro.
* src/fileio.c: Include fsusage.h.
(blocks_to_bytes, Ffile_system_info) [!DOS_NT]: New functions.
(syms_of_fileio) [!DOS_NT]: Defsubr file-system-info.

This is mostly to change http: to https: in licenses.
* COPYING, build-aux/config.guess, build-aux/config.sub:
* doc/emacs/doclicense.texi, doc/emacs/gpl.texi:
* doc/lispintro/doclicense.texi, doc/lispref/doclicense.texi:
* doc/lispref/gpl.texi, doc/misc/doclicense.texi:
* doc/misc/gpl.texi, etc/COPYING, leim/COPYING:
* lib-src/COPYING, lib/COPYING, lisp/COPYING, lwlib/COPYING:
* msdos/COPYING, nt/COPYING, src/COPYING:
Copy from Gnulib.

This incorporates:
2017-09-28 string: code style
2017-09-25 sys_types: update URL
2017-09-23 install-sh: do not assume / = //
2017-09-21 mktime: port to OpenVMS
* build-aux/install-sh, m4/mktime.m4, m4/string_h.m4:
* m4/sys_types_h.m4: Copy from Gnulib.
* lib/gnulib.mk.in: Regenerate.

This incorporates:
2017-09-16 manywarnings: port to GCC on 64-bit MS-Windows
2017-09-13 all: Replace many more http URLs by https URLs
* build-aux/config.guess, build-aux/config.sub:
* build-aux/gitlog-to-changelog, doc/misc/texinfo.tex:
* lib/allocator.h, lib/count-leading-zeros.h:
* lib/count-trailing-zeros.h, lib/dup2.c, lib/filevercmp.c:
* lib/fstatat.c, lib/fsync.c, lib/ftoastr.c, lib/ftoastr.h:
* lib/intprops.h, lib/signal.in.h, lib/stdio-impl.h, lib/stdio.in.h:
* lib/unistd.in.h, lib/utimens.c, m4/alloca.m4, m4/extern-inline.m4:
* m4/fstatat.m4, m4/gnulib-common.m4, m4/manywarnings.m4:
* m4/std-gnu11.m4, m4/sys_types_h.m4, m4/vararrays.m4:
Copy from Gnulib.
* lib/gnulib.mk.in: Regenerate.

Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November.  Change these FTP URLs to https://ftp.gnu.org
instead.  Make similar changes for URLs to other organizations moving
away from FTP.  Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.

* lib/getopt_.h: Remove.  It was renamed to lib/getopt.in.h etc.
on 2011-01-08, but I forgot to remove the old file.

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

This incorporates:
2017-09-08 stddef: Avoid conflict with system-defined max_align_t
2017-08-24 warnings: fix compilation with old autoconf
2017-08-23 glob: merge from glibc with Zanella glob changes
2017-08-17 random: Fix test compilation failure on Cygwin 1.5.25
* doc/misc/texinfo.tex, lib/flexmember.h, lib/stddef.in.h:
* lib/stdlib.in.h, m4/manywarnings.m4, m4/stdlib_h.m4:
* m4/warnings.m4:
Copy from Gnulib.
* lib/gnulib.mk.in: Regenerate.

This incorporates:
2017-08-15 renameat: ensure declaration in <stdio.h> on NetBSD
2017-08-15 extensions: enable NetBSD specific extensions
2017-08-14 open: support O_CLOEXEC
2017-08-13 reallocarray: new module
* admin/merge-gnulib (AVOIDED_MODULES): Remove ‘open’, since
it now supports O_CLOEXEC and this simplifies Emacs.
* build-aux/config.guess, lib/fcntl.in.h, lib/stdio.in.h:
* lib/stdlib.in.h, m4/extensions.m4, m4/stdlib_h.m4:
Copy from Gnulib.
* lib/cloexec.c, lib/cloexec.h, lib/open.c:
* m4/mode_t.m4, m4/open-cloexec.m4, m4/open.m4:
New files, copied from Gnulib.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
* lib-src/etags.c (O_CLOEXEC) [WINDOWSNT]:
Remove, as Gnulib does this for us.
* src/filelock.c (create_lock_file):
* src/sysdep.c (emacs_open, emacs_pipe):
Don’t worry about O_CLOEXEC == 0, as Gnulib no longer sets it to 0.