gnu: lookingglass: Update to a9.

* gnu/packages/virtualization.scm (lookingglass): Update to a9.

gnu: hexchat: Disable (duplicate) icon theme generation.

* gnu/packages/messaging.scm (hexchat): Disable (duplicate) icon theme
generation.

gnu: totem: Disable (duplicate) cache generation.

* gnu/packages/gnome.scm (totem): Disable (duplicate) cache generation.

gnu: mpv: Update to 0.28.0.

* gnu/packages/video.scm (mpv): Update to 0.28.0.
[inputs]: Change ffmpeg to ffmpeg-git, add wayland-protocols.

gnu: Add ffmpeg-git.

* gnu/packages/video.scm (ffmpeg-git): New variable.

gnu: qemu: Enable Samba support.

* gnu/packages/virtualization.scm (qemu)[arguments]: Change #:configure-flags to
a list, add --smbd flag.
[inputs]: Add samba.

gnu: icecat: Add more fixes from upstream mozilla-esr52.

* gnu/packages/gnuzilla.scm (icecat)[source]: Add selected fixes from the
upstream mozilla-esr52 repository.
* gnu/packages/patches/icecat-bug-1414945.patch,
gnu/packages/patches/icecat-bug-1424373-pt2.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.

gnu: gpgme: Find the GnuPG executable in the environment.

This partially reverts commit 0e06bec250f34d (gnu: gpgme: Build with the
latest GnuPG) because it caused python-pygpgme and python2-pygpgme to
fail to build:

<https://lists.gnu.org/archive/html/guix-devel/2017-12/msg00371.html>

* gnu/packages/gnupg.scm (gpgme)[arguments]: Remove '--enable-fixed-path'
from #:configure-flags.
[inputs]: Move gnupg to native-inputs.

gnu: nginx-documentation: Fix typo in synopsis.

* gnu/packages/web.scm (nginx-documentation)[synopis]: Add missing article.

gnu: python-sqlalchemy-utils: Update to 0.32.21.

* gnu/packages/databases.scm (python-sqlalchemy-utils): Update to 0.32.21.

gnu: python-sadisplay: Update to 0.4.8.

* gnu/packages/databases.scm (python-sadisplay): Update to 0.4.8.

gnu: r-circlize: Improve description.

* gnu/packages/cran.scm (r-circlize)[description]: Fix typo and adjust
grammar based on upstream description.

gnu: r-circlize: Update to 0.4.3.

* gnu/packages/cran.scm (r-circlize): Update to 0.4.3.

gnu: emacs-cider: Update to 0.15.1.

* gnu/packages/emacs.scm (emacs-cider): Update to 0.15.1.

gnu: adwaita-icon-theme: Update to 3.26.1.

* gnu/packages/gnome.scm (adwaita-icon-theme): Update to 3.26.1.

gnu: gexiv2: Update to 0.10.7.

* gnu/packages/gnome.scm (gexiv2): Update to 0.10.7.
[build-system]: Switch to meson-build-system.

doc: Fix typo.

* doc/guix.texi (Application Setup): Transpose words.

gnu: retroarch: Update to 1.7.0.

* gnu/packages/games.scm (retroarch): Update to 1.7.0.

gnu: libev: Improve the description.

* gnu/packages/libevent.scm (libev)[description]: Rewrite to be more
descriptive and less judgmental, based on Debian's description.

gnu: linux-libre: Adapt to renamed configuration options in 4.14.9.

This is a followup to commit 95b969bc9cde419e9cfcf4299a7524381ae7a64d.

* gnu/packages/aux-files/linux-libre/4.14-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.14-i686.conf: Adapt to the configuration
options being renamed from CONFIG_*_UNWINDER to CONFIG_UNWINDER_* in version
4.14.9.