Prevent Git from silently ignoring new files.

* .gitignore: Ignore only specific files instead of the whole
  'build-aux' directory.

gnu: Add libmpeg2.

* gnu/packages/video.scm (libmpeg2): New variable.

gnu: liba52: Build shared library.

* gnu/packages/patches/liba52-enable-pic.patch,
  gnu/packages/patches/liba52-link-with-libm.patch,
  gnu/packages/patches/liba52-set-soname.patch,
  gnu/packages/patches/liba52-use-mtune-not-mcpu.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/video.scm (liba52)[source]: Add patches.
  [native-inputs]: Add autoconf, automake, and libtool.
  [arguments]: Add "--enable-shared" to configure-flags.
  Add 'bootstrap' phase.

gnu: ruby: Remove custom 'rake gem' build phase from all gems.

* gnu/packages/ruby.scm (ruby-hoe, ruby-rake-compiler,
  ruby-net-http-persistent, ruby-minitest, ruby-minitest-sprint,
  ruby-minitest-bacon): Remove custom 'rake gem' build phase that is now
  handled automatically by the Ruby build system.

build: ruby: Run 'rake gem' when gemspec is missing.

* guix/build/ruby-build-system.scm (build): Run 'rake gem' when there is no
  gemspec in the source tree.

Co-Authored-By: David Thompson <davet@gnu.org>

gnu: samtools: Update to 1.2.

* gnu/packages/bioinformatics.scm (samtools): Update to 1.2.

gnu: pari-gp: Update to 2.7.4.

* gnu/packages/algebra.scm (pari-gp): Update to 2.7.4.

gnu: icecat: Apply more libvpx-1.4 fixes.

This is a followup to commit c803ffcb3a9d5669bf5bae62b66fa058d697545c.

* gnu/packages/patches/icecat-libvpx-1.4.patch: Augment existing patch to
  include fixes for content/media/encoder/VP8TrackEncoder.cpp.

gnu: icecat: Fix build against libvpx 1.4.

* gnu/packages/patches/icecat-libvpx-1.4.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/gnuzilla.scm (icecat)[source]: Add patch.

gnu: gst-plugins-good: Disable rtprtx tests that frequently fail.

* gnu/packages/gstreamer.scm (arguments): Add 'disable-failing-rtprtx-tests'
  phase.

gnu: libvpx: Update to 1.4.0.

* gnu/packages/patches/libvpx-fix-armhf-link.patch,
  gnu/packages/patches/libvpx-fix-ssse3-quantize.patch,
  gnu/packages/patches/libvpx-vp9-out-of-bounds-access.patch: Remove files.
* gnu-system.am (dist_patch_DATA): Remove them.
* gnu/packages/video.scm (libvpx): Update to 1.4.0.  Remove patches.  Update
  source URI.

gnu: libwmf: Fix CVE-2006-3376, CVE-2009-1364, CVE-2015-{0848,4588,4695,4696}.

* gnu/packages/patches/libwmf-CVE-2006-3376.patch,
  gnu/packages/patches/libwmf-CVE-2009-1364.patch,
  gnu/packages/patches/libwmf-CVE-2015-0848+4588+4695+4696.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/image.scm (libwmf)[source]: Add patches.

substitute: Avoid infinite loop when updating the substitute list.

Reported
at <http://lists.gnu.org/archive/html/guix-devel/2015-07/msg00119.html>.

* guix/scripts/substitute.scm (http-multiple-get): When RESP has "Connection:
  close", consume HEAD anyway; always call PROC to read from BODY.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

daemon: Flush upon '\r' when reading the substituter's stderr.

This commit had been inadvertently reverted in 322eeb8.

* nix/libstore/local-store.cc (LocalStore::getLineFromSubstituter):
  Flush when the line contains '\r'.

build: Generate 'AUTHORS'.

* build-aux/generate-authors.scm: New file.
* Makefile.am (gen-AUTHORS): New target.
  (dist-hook, .PHONY): Add it.

gnu: libreoffice: Update to 4.4.4.3.

* gnu/packages/libreoffice.scm (libreoffice): Update to 4.4.4.3.

gnu: freeipmi: Update to 1.4.9.

* gnu/packages/freeipmi.scm (freeipmi): Update to 1.4.9.

gnu: gcal: Update to 4.

* gnu/packages/gcal.scm (gcal): Update to 4.

gnu: gxmessage: Update to 3.4.3.

* gnu/packages/gxmessage.scm (gxmessage): Update to 3.4.3.
  [inputs]: Use GTK+ instead of GTK+-2.

gnu: guile-sdl: Update to 0.5.2.

* gnu/packages/sdl.scm (guile-sdl): Update to 0.5.2.
  [arguments]: Augment 'fix-env-and-path' phase to modify 'test/Makefile.in'.