Merge branch 'core-updates'

gnu: libepoxy: Fix tests on arm.

* gnu/packages/gl.scm (libepoxy)[arguments]: When building for arm,
  patch test/dlwrap.c to fix the tests.

gnu: Add libepoxy.

* gnu/packages/gl.scm (libepoxy): New variable.

Modified-By: Mark H Weaver <mhw@netris.org>

utils: 'modify-phases' no longer introduces quotes.

Suggested by Taylan Ulrich Bayırlı/Kammer <taylanbayirli@gmail.com>.

* guix/build/utils.scm (%modify-phases): Remove quotes.
* guix/build/cmake-build-system.scm (%standard-phases): Adjust
  accordingly.
* guix/build/glib-or-gtk-build-system.scm (%standard-phases): Likewise.
* guix/build/gnu-dist.scm (%dist-phases): Likewise.
* guix/build/perl-build-system.scm (%standard-phases): Likewise.
* guix/build/python-build-system.scm (%standard-phases): Likewise.
* guix/build/ruby-build-system.scm (%standard-phases): Likewise.
* guix/build/waf-build-system.scm (%standard-phases): Likewise.
* gnu/packages/bash.scm, gnu/packages/code.scm, gnu/packages/gl.scm,
  gnu/packages/gnome.scm, gnu/packages/graphics.scm,
  gnu/packages/image.scm, gnu/packages/key-mon.scm,
  gnu/packages/ocr.scm, gnu/packages/plotutils.scm,
  gnu/packages/search.scm, gnu/packages/video.scm: Likewise.

Merge branch 'master' into core-updates

gnu: freeglut: Add mesa to propagated inputs.

* gnu/packages/gl.scm (freeglut): Add mesa to propagated inputs.

Merge branch 'master' into core-updates

gnu: mesa: Enable more optional features.

* gnu/packages/gl.scm (mesa): Enable DRM support of EGL, thread local storage
  in GLX, and off-screen rendering.

gnu: mesa: Fix file names passed to dlopen(3).

* gnu/packages/gl.scm (mesa): Patch source files to make file names passed to
  dlopen(3) absolute.

gnu: Add mesa-utils.

* gnu/packages/gl.scm (mesa-utils): New variable.
(mesa-demos-source): New procedure.

gnu: mesa: Propagate inputs libxshmfence and libxfixes.

* gnu/packages/gl.scm (mesa): Propagate inputs libxshmfence and libxfixes.

gnu: mesa: Add input s2tc.

* gnu/packages/gl.scm (mesa): Add input s2tc, patch sources to make the
  reference to libtxc_dxtn.so absolute since it's passed to dlopen(3).

gnu: Add s2tc.

* gnu/packages/gl.scm (s2tc): New variable.
(mesa-headers): New variable.

Merge branch 'master' into core-updates

gnu: freeglut: Propagate input glu.

* gnu/packages/gl.scm (freeglut): Make glu a propagated input instead of a
  normal input.

gnu: Add GLEW.

* gnu/packages/gl.scm (glew): New variable.

Merge branch 'master' into core-updates

gnu: mesa: Fix build on non-intel systems.

* gnu/packages/gl.scm (mesa): On non-intel systems, pass
  "--with-dri-drivers=" configure flag with i915 and i965 removed.

Merge branch 'master' into core-updates

Merge branch 'xorg-updates'