gnu: Add dependency on Perl's 'Module::Build' as needed.

'Module::Build' was deprecated in Perl 5.20 and removed in 5.22.
Some packages need to explicitly depend on it now.

* gnu/packages/perl.scm (perl-class-factory-util):
(perl-date-manip, perl-devel-checkbin): Add 'native-inputs' field.
(perl-module-build)[description]: Mention that it used to be in Perl.
* gnu/packages/web.scm (perl-cgi-simple)[native-inputs]: Add
PERL-MODULE-BUILD.

gnu: ffmpeg: Update to 2.8.5.

* gnu/packages/video.scm (ffmpeg): Update to 2.8.5.

gnu: librsvg: Update to 2.40.13 [fixes CVE-2015-7558].

* gnu/packages/patches/librsvg-tests.patch: Delete file.
* gnu-system.am (dist_patch_DATA): Remove it.
* gnu/packages/gnome.scm (librsvg): Update to 2.40.13.
  [source]: Remove patch.

gnu: automake: Adjust to deal with Perl 5.22.

Fixes <http://bugs.gnu.org/22375>.

* gnu/packages/patches/automake-regexp-syntax.patch: New file.
* gnu/packages/autotools.scm (automake)[source]: Use it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: gawk: Protect against random failures of the 'fts' test.

* gnu/packages/patches/gawk-fts-test.patch: New file.
* gnu/packages/gawk.scm (gawk)[source]: Use it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: cross-gcc-arguments: Enable C++, disable building of libstdc++-v3.

* gnu/packages/cross-base.scm (cross-gcc-arguments)[arguments]: Disable
  building libstdc++-v3 and enable building C++ compiler.

tests: Use sed instead of grep as a package with no dependencies.

* tests/graph.scm ("node-edges"): Choose SED instead of GREP as the
example.

Merge branch 'master' into core-updates

hydra: Add missing phase and inputs for 'make dist' job.

* build-aux/hydra/guix.scm (tarball-package): Inherit from 'guix-devel'
rather than 'guix'.  Pass #:phases to 'dist-package'.

build-system/gnu: 'dist-package' can be passed the phases.

* guix/build-system/gnu.scm (dist-package): Add #:phases parameter and
honor it.

monad-repl: Close connection when leaving the monad REPL.

* guix/monad-repl.scm (store-monad-language): Add 'store' parameter and
use it.  Remove call to 'open-connection'.
(enter-store-monad): Use 'with-store' and pass the store to
'store-monad-language.

gnu: julia: Update to 0.4.3.

* gnu/packages/julia.scm (julia): Update to 0.4.3.
(libuv-julia): Update to 07730c4bd595.

emacs: Move loading packages to "guix-emacs.el".

* emacs/guix-init.el: Move the code for auto-loading Emacs packages to...
  (guix-package-enable-at-startup): Move to...
* emacs/guix-emacs.el (guix-package-enable-at-startup): ... here.

emacs: Make "guix-emacs.el" independent.

"guix-emacs.el" may be used just for "instructing" Emacs where to find
Emacs packages installed with Guix, so it should have as few
dependencies as possible.

See <http://lists.gnu.org/archive/html/guix-devel/2016-01/msg00022.html>.

* emacs/guix-emacs.el: Require 'guix-profiles' optionally.
  (guix-emacs-load-autoloads): Use 'guix-profile-prompt' only if it is
  available.

emacs: Complete --file in 'guix build' popup.

* emacs/guix-command.el (guix-command-improve-build-argument): Use
  'guix-read-file-name' to complete --file option.

emacs: Add missing shell completions.

* emacs/guix-pcomplete.el (guix-pcomplete-complete-option-arg): Complete
  file name for '--install-from-file' option of 'guix package' command,
  and for '--file' and '--with-source' options of 'guix build' command.

gnu: isc-dhcp: Update to 4.3.3-P1 [fixes CVE-2015-8605].

* gnu/packages/admin.scm (isc-dhcp): Update to 4.3.3-P1.

gnu: samtools: Update to 1.3.

* gnu/packages/bioinformatics.scm (samtools): Update to 1.3.
[arguments]: Enable tests for all architectures; set ncurses in
configure-flags instead of make-flags; simplify "patch-tests" phase;
restore "configure" phase.

build: Use 127 as the Linux hash-bang limit.

Reported by taylanbayirli@gmail.com (Taylan Ulrich Bayırlı/Kammer).

* m4/guix.m4 (LINUX_HASH_BANG_LIMIT): Set to 127.

gnu: skribilo: Update to 0.9.3.

* gnu/packages/skribilo.scm (skribilo): Update to 0.9.3.
[native-inputs]: New field.