gnu: Switch to GCC 4.9 as the default cross-compiler.

* gnu/packages/cross-base.scm: Replace all occurrences of "gcc-4.8" with
  "gcc-4.9".

gnu: Switch to GCC 4.9 as the default compiler.

* gnu/packages/commencement.scm: Replace all occurrences of "gcc-4.8" with
  "gcc-4.9".
  (gcc-boot0)[arguments]: Add --disable-libcilkrts --disable-libvtv.

gnu: linux-libre-headers: Do not retain reference to the bootstrap tools.

* gnu/packages/linux.scm (linux-libre-headers)[install-phase]: Remove
  ".install" files from the output.
  [arguments]: Add #:allowed-references.

gnu: findutils: Use /var as the localstatedir, for 'updatedb'.

* gnu/packages/patches/findutils-localstatedir.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/base.scm (findutils)[source]: Use it.
  [arguments]: Pass --localstatedir=/var.

gnu: perl: Strip the DSOs.

* gnu/packages/perl.scm (perl)[arguments]: Add 'make-shared-objects-writable'
  phase.

gnu: perl: Use 'modify-phases'.

* gnu/packages/perl.scm (perl)[arguments]: Use 'modify-phases' instead of
  'alist-replace'.

gnu: gcc: Move patch upstream status in the patch itself.

* gnu/packages/patches/gcc-arm-link-spec-fix.patch: Add bug and patch URLs.
* gnu/packages/gcc.scm (gcc-4.8): Remove them.

gnu: gawk: Update to 4.1.3.

* gnu/packages/gawk.scm (gawk): Update to 4.1.3.

gnu: flex: Fix native-inputs field.

This is a followup to ba42199eb3 and dedaf76f66.

* gnu/packages/flex.scm (flex)[native-inputs]: Add another layer of
  parentheses.

gnu: libxml2: Build python bindings separately.

* gnu/packages/xml.scm (libxml2)[native-inputs]: Remove python.
  [arguments]: Remove.
  (python-libxml2, python2-libxml2): New variables.

gnu: libxml2: Update to 2.9.2.

* gnu/packages/xml.scm (libxml2): Update to 2.9.2.

gnu: base: Fix a bug that occurs in non-Linux systems.

* gnu/packages/base.scm (tar): Apply patch.
* gnu/packages/patches/tar-d_ino_in_dirent-fix.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: flex: Add missing quasiquote.

* gnu/packages/flex.scm (flex): Add missing quasiquote at native-inputs.

gnu: flex: Add m4 as a native input.

* gnu/packages/flex (flex): Add m4 as a native input.

gnu: bison: Add m4 as a native input.

* gnu/packages/bison (bison): Add m4 as a native input.

gnu: mesa: Update to 10.5.4.

* gnu/packages/gl.scm (mesa): Update version to 10.5.4.  Add libxvmc to
  inputs.  Remove python, gettext, flex, and bison from native-inputs.  Remove
  hack that was necessary to prevent rebuilding parts of the build system.

gnu: mesa: Add libva input.

There is a circular dependency between Mesa and libVA, so we use a
libva-no-mesa package that builds libVA without GLX and EGL support, and use
that for building Mesa.

* gnu/packages/gl.scm (libva-for-mesa): New variable.
(mesa): Add as input.

gnu: polkit-qt: Add $libdir to RUNPATH.

* gnu/packages/polkit.scm (polkit-qt)[arguments]: Add
  #:configure-flags.

gnu: mariadb: Remove now unneeded workaround.

This has been redundant since 21e583d.

* gnu/packages/databases.scm (mariadb)[arguments]: Remove LDFLAGS
  definition.

gnu: ganv: Set the RUNPATH of binaries to $libdir.

* gnu/packages/gtk.scm (ganv)[arguments]: Add 'set-ldflags' phase.