gnu: wavpack: Fix wavpack.pc by passing '--libdir' to `configure'.

* gnu/packages/audio.scm (wavpack)[arguments]: New field.

gnu: Add Csound.

* gnu/packages/audio.scm (csound): New variable.

gnu: Add WavPack.

* gnu/packages/audio.scm (wavpack): New variable.

gnu: portaudio: Patch for Audacity compatibility.

* gnu/packages/audio.scm (portaudio): Add a patch for Audacity compatibility.
* gnu/packages/patches/portaudio-audacity-compat.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: lv2-mda-piano: change source URL.

* gnu/packages/audio.scm (lv2-mda-piano)[source]: Change URL of git
  repository to new upstream.

gnu: clalsadrv: Move snippet to build phase and set LIBDIR.

* gnu/packages/audio.scm (clalsadrv): Move snippet to build phase and set
  LIBDIR.

gnu: zita-alsa-pcmi: Move snippet to build phase and set LIBDIR.

* gnu/packages/audio.scm (zita-alsa-pcmi): Move snippet to build phase
  and set LIBDIR.

gnu: Add rsound.

* gnu/packages/audio.scm (rsound): New variable.

gnu: Move 'openal' to (gnu packages audio).

* gnu/packages/games.scm (openal): Removed variable.
* gnu/packages/audio.scm (openal): New variable.

gnu: Add libbs2b.

* gnu/packages/audio.scm (libbs2b): New variable.

gnu: Add faad2.

* gnu/packages/audio.scm (faad2): New variable.

gnu: Move 'which' to (gnu packages base).

* gnu/packages/which.scm: Remove.
* gnu-system.am (GNU_SYSTEM_MODULES): Remove it.
* gnu/packages/base.scm (which): New variable.
* gnu/packages/aspell.scm, gnu/packages/audio.scm,
  gnu/packages/autogen.scm, gnu/packages/cdrom.scm,
  gnu/packages/compression.scm, gnu/packages/datamash.scm,
  gnu/packages/games.scm, gnu/packages/glib.scm,
  gnu/packages/gnu-pw-mgr.scm, gnu/packages/gnutls.scm,
  gnu/packages/gps.scm, gnu/packages/guile.scm,
  gnu/packages/java.scm, gnu/packages/libevent.scm,
  gnu/packages/linux.scm, gnu/packages/lisp.scm,
  gnu/packages/node.scm, gnu/packages/ntp.scm,
  gnu/packages/orpheus.scm, gnu/packages/pciutils.scm,
  gnu/packages/python.scm, gnu/packages/qt.scm,
  gnu/packages/rsync.scm, gnu/packages/sawfish.scm,
  gnu/packages/scheme.scm, gnu/packages/ssh.scm,
  gnu/packages/statistics.scm, gnu/packages/texlive.scm,
  gnu/packages/wdiff.scm: Adjust accordingly.

Merge branch 'core-updates'.

Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/gnupg.scm

gnu: Add AlsaModularSynth.

* gnu/packages/audio.scm (alsa-modular-synth): New variable.

gnu: Add clalsadrv.

* gnu/packages/audio.scm (clalsadrv): New variable.

gnu: Add zita-alsa-pcmi.

* gnu/packages/audio.scm (zita-alsa-pcmi): New variable.

gnu: Add LV2 mda EPiano plugin.

* gnu/packages/audio.scm (lv2-mdaepiano): New variable.

gnu: Add LV2 mda Piano plugin.

* gnu/packages/audio.scm (lv2-mdapiano): New variable.

gnu: Add 'file-name' fields for github source tarballs without a name.

* gnu/packages/aarddict.scm (aarddict), gnu/packages/algebra.scm (arb),
  gnu/packages/audio.scm (jack-2, lvtk),
  gnu/packages/bioinformatics.scm (bedops, bedtools, bowtie),
  gnu/packages/game-development.scm (tiled),
  gnu/packages/games.scm (minetest-data, minetest, retroarch),
  gnu/packages/jrnl.scm (jrnl), gnu/packages/kde.scm (qjson),
  gnu/packages/libevent.scm (libuv), gnu/packages/linux.scm (pflask),
  gnu/packages/mail.scm (offlineimap, libetpan),
  gnu/packages/maths.scm (arpack-ng), gnu/packages/ninja.scm (ninja),
  gnu/packages/nutrition.scm (gourmet),
  gnu/packages/python.scm (python-cairocffi), gnu/packages/rdf.scm (lrdf),
  gnu/packages/ruby.scm (ruby-i18n), gnu/packages/sxiv.scm (sxiv): Add
  'file-name' field to origin.