gnu: Add clutter.

* gnu/packages/gnome.scm (clutter): New variable.

gnu: Add cogl.

* gnu/packages/gnome.scm (cogl): New variable.

gnu: sipwitch: Update to 1.9.8.

* gnu/packages/telephony.scm (sipwitch): Update to 1.9.8.

gnu: commencement: Make a few variables private.

This removes ambiguity warnings when installing these packages.

* gnu/packages/commencement.scm (glibc-final, gcc-final,
  glibc-utf8-locales-final): Make private.

gnu: imagemagick: Do not retain reference to "doc" output.

* gnu/packages/imagemagick.scm (imagemagick)[arguments]: Use 'modify-phases'.
  Add 'strip-configure-xml' phase.

gnu: ucommon: Update to 6.3.4.

* gnu/packages/telephony.scm (ucommon): Update to 6.3.4.

Merge branch 'master' into core-updates

gnu: jemalloc: Build with gcc-4.8 on i686.

* gnu/packages/jemalloc.scm (jemalloc)[native-inputs]: When compiling natively
  on i686, add gcc-4.8.

gnu: lame: Build with gcc-4.8 on i686.

* gnu/packages/mp3.scm (lame)[native-inputs]: When compiling natively on i686,
  add gcc-4.8.

gnu: Add fasttree.

* gnu/packages/bioinformatics.scm (fasttree): New variable.

gnu: ffmpeg: Update to 2.7.1.

* gnu/packages/video.scm (ffmpeg): Update to 2.7.1.

gnu: totem-pl-parser: Add gobject-introspection support.

* gnu/packages/gnome.scm (totem-pl-parser)[native-inputs]: Add
  gobject-introspection.

gnu: totem-pl-parser: Move glib, gmime, and libxml2 to propagated-inputs.

* gnu/packages/gnome.scm (totem-pl-parser)[inputs]: Move glib, gmime, and
  libxml2 to ...
  [propagated-inputs]: ... here.

gnu: gsl: Fix poly test on i686.

* gnu/packages/patches/gsl-poly-test-fix-pt1.patch,
  gnu/packages/patches/gsl-poly-test-fix-pt2.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/maths.scm (gsl)[source]: Add patches.

gnu: gnome-doc-utils: Add python2-libxml2 to native-inputs.

This is a followup to commit 7ce3224247d3acd559841f23d1b4b49d073b15f5.

* gnu/packages/gnome.scm (gnome-doc-utils)[native-inputs]: Add
  python2-libxml2.

gnu: itstool: Add python2-libxml2 to propagated-inputs.

This is a followup to commit 7ce3224247d3acd559841f23d1b4b49d073b15f5.

* gnu/packages/glib.scm (itstool)[propagated-inputs]: Add python2-libxml2.

gnu: mdadm: Add compilation fix for gcc-4.9.

* gnu/packages/patches/mdadm-gcc-4.9-fix.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/linux.scm (mdadm): Add patch.

gnu: clang: Build without debugging symbols.

* gnu/packages/llvm.scm (clang-from-llvm)[arguments]: Add #:build-type.

gnu: clang: Allow 'clang' to link executables.

* gnu/packages/patches/clang-libc-search-path.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/llvm.scm (clang-from-llvm)[source]: Use it.
  [inputs]: Add "gcc-lib".
  [arguments]. Add -DGCC_INSTALL_PREFIX and -DC_INCLUDE_DIRS to
  #:configure-flags.  Add #:phases argument.

gnu: clang: Add search path specifications.

* gnu/packages/llvm.scm (clang-from-llvm)[native-search-paths]: New field.