gnu: wxwidgets: Use webkitgtk-2.4.

* gnu/packages/wxwidgets.scm (wxwidgets)[inputs]: Replace "webkitgtk" by
"webkitgtk-2.4".

gnu: aria-maestosa: Use scons-build-system.

* gnu/packages/music.scm (aria-maestosa)[build-system]: Use
scons-build-system.
[native-inputs]: Remove scons-python2.
[arguments]: Use scons-python2.
<#:phases>: Remove custom phases "build" and "install".
Add custom phase "fix-directory-permissions".

gnu: aria-maestosa: Use scons-python2.

* gnu/packages/music.scm (aria-maestosa)[native-inputs]: Replace "scons" by
"scons-python2".

gnu: parallel: Don't end phase with #<undefined>.

* gnu/packages/parallel.scm (parallel)[arguments]: Use INVOKE.

gnu: parallel: Update to 20180122.

* gnu/packages/parallel.scm (parallel): Update to 20180122.

gnu: guix: Update snapshot to 33988f9.

* gnu/packages/package-management.scm (guix): Update to 33988f9.

gnu: python-kivy: Add "git" native-input.

* gnu/packages/python.scm (python-kivy)[native-inputs]: Add git.

gnu: khmer: Add aarch64-linux to supported systems.

* gnu/packages/bioinformatics.scm (khmer)[supported-systems]: Add
aarch64-linux to the supported systems.

gnu: nss-certs: Update to 3.35.

* gnu/packages/certs.scm (nss-certs): Update to 3.35.

gnu: iq80-snappy: Improve synopsis & description.

* gnu/packages/compression.scm (iq80-snappy)[synopsis, description]: Fix
typos and add ‘(de)compressor’ keywords.

gnu: go: Improve description.

* gnu/packages/golang.scm (go-1.4)[description]: Edit for clarity.

gnu: go@1.9: Drop left-over work-around.

* gnu/packages/golang.scm (go-1.9)[arguments]: Remove substitution for
fixed bug from the ‘prebuild’ phase.

gnu: direnv: Edit description.

* gnu/packages/shellutils.scm (direnv)[description]: Edit and use @file.

gnu: direnv: Use HTTPS for home page.

* gnu/packages/shellutils.scm (direnv)[home-page]: Use HTTPS.

gnu: youtube-dl: Return #t from phases.

* gnu/packages/video.scm (youtube-dl)[arguments]: Return #t from
‘fix-the-data-directories’ phase.

gnu: youtube-dl: Update to 2018.01.21.

* gnu/packages/video.scm (youtube-dl): Update to 2018.01.21.
[description]: Update.  ‘A few’ is simply no longer true.

gnu: mktorrent: Add missing @dfn to description.

* gnu/packages/bittorrent.scm (mktorrent)[description]: Add missing @dfn.

gnu: libtorrent-rasterbar: Update home page.

* gnu/packages/bittorrent.scm (libtorrent-rasterbar)[home-page]: Use extant domain.

gnu: newt: Update to 0.52.20.

* gnu/packages/slang.scm (newt): Update to 0.52.20.

gnu: mia: Update to 2.4.6.

* gnu/packages/image-processing.scm (mia): Update to 2.4.6.