* configure.ac (--with-webp): New option.
(HAVE_WEBP): New variable.
(emacs_config_features): Add webp.
* src/image.c (enum webp_keyword_index) [HAVE_WEBP]: New enum.
(webp_format) [HAVE_WEBP]: New variable.
(webp_image_p, init_webp_functions, webp_load) [HAVE_WEBP]: New
functions for WebP support.
(image_types) [HAVE_WEBP]: Define WebP format.
(syms_of_image) <Qwebp> [HAVE_WEBP]: New DEFSYM.  Add image type Qwebp.
* src/Makefile.in (LIBIMAGE): Add WEBP_LIBS.

* lisp/files.el (auto-mode-alist):
* lisp/image-file.el (image-file-name-extensions):
* lisp/image.el (image-type-header-regexps)
(image-type-file-name-regexps, image-type-auto-detectable): Add WebP
support.
* lisp/term/w32-win.el (dynamic-library-alist): Add the libwebp DLL.

* INSTALL:
* admin/CPP-DEFINES:
* doc/lispref/display.texi (Image Formats, Other Image Types):
* nt/INSTALL: Document WebP support.

* test/lisp/image-tests.el (image-find-image)
(image-type-from-file-name): Expand tests.
* test/src/image-tests.el (image-tests--files): Add WebP.
(image-tests-image-size/webp, image-tests-image-mask-p/webp)
(image-tests-image-metadata/webp): New tests.
* test/data/image/black.webp: New file.

Make the following changes by hand, and run 'admin/merge-gnulib'.
* .gitignore: Add lib/malloc/*.gl.h.
* admin/merge-gnulib: Copy lib/af_alg.h and lib/save-cwd.h
directly from Gnulib, without worrying about Gnulib modules,
as these files are special cases.
(AVOIDED_MODULES): Remove malloc-posix.
* lib/malloc.c, lib/realloc.c, m4/malloc.m4, m4/realloc.m4:
* m4/year2038.m4: New files, copied from Gnulib.
* lib/malloca.c, lib/malloca.h:
* m4/close-stream.m4, m4/glibc21.m4, m4/malloca.m4:
Remove.  These are either no longer present in Gnulib, or are no
longer needed by modules that Emacs uses.
* oldXMenu/AddPane.c, oldXmenu/Addsel.c: Include XmenuInt.h first;
needed for new Gnulib.
* src/xmenu.c: Call emacs_abort, not abort.

Run "TZ=UTC0 admin/update-copyright".

Recipe contributed by Joseph Mingrone <jrm@ftfl.ca>.

75723ec212 (origin/emacs-27) ; * lisp/emacs-lisp/benchmark.el (benchm...
53e2a612ad ; * lib-src/make-fingerprint.c: Update commentary.
286c632772 Reformat argument commentary in etags.c
4ec740866a Make the invocation of combine-change-calls in comment-reg...
66bcec8838 * lisp/progmodes/cc-langs.el (c-<>-notable-chars-re): Fix ...
03eeab469e ; Update the expected result files in test/manual/etags.
d875a22bc6 Update the various INSTALL files

# Conflicts:
#	INSTALL

* nt/INSTALL.W64:
* nt/INSTALL:
* INSTALL: Update the installation information, in particular the
fact that HarfBuzz is now preferred as the shaping library.

e0de9f3295 (origin/emacs-27) Don't skip empty lines when fitting mini...
a4ec03fa9b ; * etc/tutorials/TUTORIAL.de: Fix grammar (Bug#44246)
20c02e628c Improve documentation of display-fill-column-indicator
e2005f1f2a * INSTALL: Mention efaq.texi for installation of intlfonts.
71661b2872 Use WebKit sandboxing

# Conflicts:
#	etc/NEWS

Also, update description of debuginfo and sources to match
Debian and Red Hat more accurately, and move this sad tale
from INSTALL to etc/PROBLEMS which is a better home for it.
* Makefile.in (emacs_srcdir, install-c-src):
* configure.ac (emacs_srcdir, --with-install-srcdir):
* src/epaths.in (PATH_EMACS_SOURCE):
* src/lread.c (emacs-source-directory):
Remove.  All uses removed.
* lisp/emacs-lisp/find-func.el (find-function-C-source):
Do not worry about compressed C sources.
* src/lread.c: Do not include <dosname.h>.