gnu: imagemagick: Update to 6.9.8-10.

* gnu/packages/imagemagick.scm (imagemagick): Update to 6.9.8-10.

gnu: weechat: Update to 1.9.

* gnu/packages/irc.scm (weechat): Update to 1.9.

gnu: perl-image-exiftool: Update to 10.55.

* gnu/packages/photo.scm (perl-image-exiftool): Update to 10.55.
[arguments]: Use modify-phases syntax.

gnu: Remove libwmf.

This package contains many security vulnerabilities and is no longer maintained
upstream. See this discussion for more information:

https://lists.gnu.org/archive/html/guix-devel/2017-05/msg00478.html

* gnu/packages/image.scm (libwmf): Remove variable.
* gnu/packages/wv.scm (wv)[inputs]: Remove libwmf.
[arguments]: Remove field.
* gnu/packages/abiword.scm (abiword)[inputs]: Remove libwmf.
[source]: Remove patch 'abiword-wmf-version-lookup-fix.patch'.
* gnu/packages/patches/abiword-wmf-version-lookup-fix.patch,
gnu/packages/patches/libwmf-CAN-2004-0941.patch,
gnu/packages/patches/libwmf-CVE-2006-3376.patch,
gnu/packages/patches/libwmf-CVE-2007-0455.patch,
gnu/packages/patches/libwmf-CVE-2007-2756.patch,
gnu/packages/patches/libwmf-CVE-2007-3472.patch,
gnu/packages/patches/libwmf-CVE-2007-3473.patch,
gnu/packages/patches/libwmf-CVE-2007-3477.patch,
gnu/packages/patches/libwmf-CVE-2009-1364.patch,
gnu/packages/patches/libwmf-CVE-2009-3546.patch,
gnu/packages/patches/libwmf-CVE-2015-0848+CVE-2015-4588.patch,
gnu/packages/patches/libwmf-CVE-2015-4695.patch,
gnu/packages/patches/libwmf-CVE-2015-4696.patch: Delete files.
* gnu/local.mk (dist_patch_DATA): Remove them.

gnu: retroarch: Update to 1.6.1.

* gnu/packages/games.scm (retroarch): Update to 1.6.1.
[home-page]: Use HTTPS.

gnu: Add armagetronad.

* gnu/packages/games.scm (armagetronad): New variable.

gnu: Add eog-plugins.

* gnu/packages/gnome.scm (eog-plugins): New variable.

gnu: libpeas: Propagate gobject-introspection.

* gnu/packages/gnome.scm (libpeas)[propagated-inputs]: New field.

refresh: Be more verbose when passed an explicit package list.

* guix/scripts/refresh.scm (check-for-package-update): Use
'version-compare' instead of 'version>?'.  When WARN? is true, print
something for the '=' and '<' cases.

gnu: geeqie: Enable map support.

* gnu/packages/image-viewers.scm (geeqie)[arguments]: Add
 #:configure-flags.
[inputs]: Add CLUTTER and LIBCHAMPLAIN.

gnu: Add hugin.

* gnu/packages/photo.scm (hugin): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: libffcall: Update to 1.13.

* gnu/packages/libffcall.scm (libffcall): Update to 1.13.
[source]: Use url-fetch, download from GNU mirror.
[supported-systems]: Remove field.

gnu: Add emacs-dired-hacks.

* gnu/packages/emacs.scm (emacs-dired-hacks): New variable.

Co-authored-by: Alex Kost <alezost@gmail.com>

gnu: font-google-material-design-icons: Use 'font-build-system'.

* gnu/packages/fonts.scm (font-google-material-design-icons): Re-indent.
Switch to font-build-system.

Signed-off-by: 宋文武 <iyzsong@member.fsf.org>

gnu: epiphany: Add gdk-pixbuf input.

* gnu/packages/gnome.scm (epiphany)[inputs]: Add gdk-pixbuf.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>

gnu: Add adms.

* gnu/packages/engineering.scm (adms): New variable.

gnu: Add meep.

* gnu/packages/engineering.scm (meep): New variable.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>

gnu: Add mpb.

* gnu/packages/engineering.scm (mpb): New variable.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>

gnu: Add guile-libctl.

* gnu/packages/engineering.scm (guile-libctl): New variable.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>

gnu: Add harminv.

* gnu/packages/engineering.scm (harminv): New variable.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>