gnu: libelf: Support aarch64.

* gnu/packages/elf.scm (libelf)[arguments]: Modify custom configure
phase to declare host type on aarch64.

gnu: libgpg-error: Update to 1.26.

* gnu/packages/gnupg.scm (libgpg-error): Update to 1.26.

gnu: libtasn1: Update to 4.10.

* gnu/packages/tls.scm (libtasn1): Update to 4.10.

gnu: gnutls: Update to 3.5.9.

* gnu/packages/tls.scm (gnutls): Update to 3.5.9.

gnu: xf86-video-geode: Update to 2.11.19.

* gnu/packages/xorg.scm (xf86-video-geode): Update to 2.11.19.

gnu: bdftopcf: Use libxfont2.

* gnu/packages/xorg.scm (bdftopcf)[inputs]: Replace libxfont with libxfont2.

gnu: openssl: Incorporate grafted changes.

This un-grafts 544db93cafc3e0bf9a89623b8fed3a169958c1d3.

* gnu/packages/tls.scm (openssl): Update to 1.0.2k.
[replacement]: Remove field.
(openssl-1.0.2k): Remove variable.
(openssl-next)[replacement]: Remove field.

gnu: mesa: Update to 13.0.5.

* gnu/packages/gl.scm (mesa): Update to 13.0.5.

gnu: xf86-input-wacom: Fix compatibility with xorg ABI 25.

* gnu/packages/patches/xf86-input-wacom-xorg-abi-25.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/xdisorg.scm (xf86-input-wacom)[source](patches): Use it.

gnu: xf86-video-intel: Change to libxfont2 ABI.

* gnu/packages/xorg.scm (xf86-video-intel)[inputs]: Change LIBXFONT to LIBXFONT2.

gnu: xf86-video-qxl: Change to libxfont2 ABI.

* gnu/packages/xorg.scm (xf86-video-qxl)[inputs]: Change LIBXFONT to LIBXFONT2.

gnu: xorg-server: Update to 1.19.1.

* gnu/packages/xorg.scm (xorg-server, xorg-server-xwayland): Update to 1.19.1.
[inputs]: Change from LIBXFONT to LIBXFONT2. Add LIBEPOXY.

gnu: xorg-server: Use 'modify-phases' syntax.

* gnu/packages/xorg.scm (xorg-server)[arguments]: Use 'modify-phases'.

gnu: Add libxfont@2.

* gnu/packages/xorg.scm (libxfont2): New variable.

gnu: cmake: Run tests in parallel.

* gnu/packages/cmake.scm (cmake)[arguments]: Add 'set-test-environment' phase.

gnu: cmake: Remove bundled software.

* gnu/packages/cmake.scm (cmake)[source]: Add 'snippet' to remove bundled
libraries.
[arguments]: Drop removed files from 'patch-bin-sh' phase.
[license]: Update for remaining software.

gnu: cmake: Update to 3.7.2.

* gnu/packages/cmake.scm (cmake): Update to 3.7.2.
[arguments]: Fix truthiness of some phases.
[inputs]: Add LIBUV.

Merge branch 'staging' into core-updates

Conflicts:
	gnu/local.mk: Missing mention of gdk-pixbuf-list-dir.patch in the
	commit log really confused me here... It's from 8c6b077bfae (staging).
	gnu/packages/xorg.scm: xkeyboard-config updated both places.

gnu: Add bootstrap-binaries for 'aarch64-linux'.

These bootstrap-binaries were built against commit
8f8f250bdca917b3ce38aa0902f01b19081859a4.

* gnu/packages/bootstrap/aarch64-linux/bash,
gnu/packages/bootstrap/aarch64-linux/mkdir,
gnu/packages/bootstrap/aarch64-linux/xz,
gnu/packages/bootstrap/aarch64-linux/tar: New files.

* gnu/local.mk (bootstrap_aarch64_linuxdir)
(dist_bootstrap_aarch64_linux_DATA)
(nodist_bootstrap_aarch64_linux_DATA): New variables.
(DISTCLEANFILES): Add $(nodist_bootstrap_aarch64_linux_DATA).
(gnu/packages/bootstrap/aarch64-linux/guile-2.0.14.tar.xz): New target.
* build-aux/download.scm (filename->uri): Add aarch64-linux entry.
* gnu/packages/bootstrap.scm (raw-build): Use guile-2.0.14.tar.xz on
aarch64-linux.
(glibc-dynamic-linker, %bootstrap-coreutils&co, %boostrap-binutils)
(%bootstrap-glibc, %bootstrap-gcc): Add aarch64-linux cases.
* m4/guix.m4 (GUIX_SYSTEM_TYPE): Add aarch64 case.
(GUIX_ASSERT_SUPPORTED_SYSTEM): Add aarch64-linux to supported list.
* doc/guix.texi (GNU Distribution): Add aarch64-linux to the list of
supported systems.
* tests/packages.scm (package-search-derivation, snippet): Add aarch64
case.

daemon: Ensure proper alignment on the stack.

* nix/libstore/build.cc (startBuilder): When calling 'clone', increase
the step to 16 and ensure it aligns properly on the stack.