gnu: hop: Remove use of patchelf.

* gnu/packages/patches/hop-linker-flags.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/scheme.scm (source)[patches]: Use it.
  (arguments)[phases]: Remove patch-rpath phase.
  [modules, imported-modules]: Remove.
  (native-inputs): Remove field.

gnu: Add elogind.

* gnu/packages/freedesktop.scm (elogind): New variable.

gnu: Add IR.

* gnu/packages/audio.scm (ir): New variable.

gnu: Add zita-convolver.

* gnu/packages/audio.scm (zita-convolver): New variable.

download: Work around Guile small-receive-buffer bug.

Previously, code using directly (guix build download) was still affected
by <http://bugs.gnu.org/15368>.  This includes source derivations, the
'guix download' command, and (guix gnu-maintenance).

'guix substitute' was unaffected since it used (guix http-client), which
already had the fix.

* guix/http-client.scm (open-socket-for-uri): Remove.
  (http-fetch): Remove #:buffered? argument to 'open-socket-for-uri';
  use 'setvbuf' instead.
* guix/scripts/substitute.scm (fetch): Likewise.
* guix/build/download.scm (open-socket-for-uri): New procedure, taken
  from guix/http-client.scm, but without the #:buffered? parameter.

download: Reinstate buffering on connection sockets.

* guix/build/download.scm (open-connection-for-uri): Reinstate call to
  'setvbuf' inadvertently removed in d17551d9.

gnu: webkitgtk: Remove unnecessary make flag.

* gnu/packages/webkit.scm (webkitgtk): Remove make-flags.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

activation: Make user copies of the skeletons writable.

* gnu/build/activation.scm (make-file-writable,
  make-skeletons-writable): New procedures.
  (copy-account-skeletons): Call 'make-file-writable' after 'copy-file'.
  (add-user): Add call to 'make-skeletons-writable'.

gnu: librevenge, libwpd, libwpg: Fix 'license' field.

* gnu/packages/libreoffice.scm (librevenge, libwpd, libwpg): Fix
  'license' field to be a list of <license>.

services: Group desktop services in (gnu services desktop).

* gnu/services/colord.scm, gnu/services/dbus.scm,
  gnu/services/upower.scm: Remove.
* gnu/services/desktop.scm: New file, with contents taken from the above
  files.
* gnu-system.am (GNU_SYSTEM_MODULES): Adjust accordingly.
* doc/guix.texi (Desktop Services): New section.
  (Various Services): Move colord-service and upower-service from
  here to "Desktop Services".

gnu: hop: Fix RPATHs.

* gnu/packages/scheme.scm (inputs): Move patchelf input to...
  (native-inputs): ...here.  New field.
  (arguments)[phases]: Use augment-rpath for patch-rpath phase.

gnu: perl-json-any: Fix typo in source uri scheme.

* gnu/packages/perl.scm (perl-json-any)[source]: Fix typo.

gnu: webkitgtk: Fix compilation on x86_64.

* gnu/packages/webkit.scm (webkitgtk): Move library install path from lib64 to
 lib.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: wxwidgets-2: Add $libdir to RUNPATH.

* gnu/packages/wxwidgets.scm (wxwidgets-2)[arguments]: Add #:make-flags,
  as for WXWIDGETS.

gnu: mozjs: Mark as unsupported on mips64el-linux.

* gnu/packages/gnuzilla.scm (mozjs)[supported-systems]: New field.

gnu: gpgme: Build against GnuPG 2.0.

* gnu/packages/gnupg.scm (gpgme)[inputs]: Change to GNUPG-2.0.

environment: Move iteration outside of 'for-each-search-path'.

* guix/search-paths.scm (search-path-definition): New procedure.
* guix/scripts/environment.scm (for-each-search-path): Rename to...
  (evaluate-input-search-paths): ... this.  Remove 'proc' and 'pure?'
  parameters, and return directly the list of search-path/value pairs.
  (create-environment): Use 'for-each' and 'evaluate-input-search-paths'
  instead of 'for-each-search-path'.
  (show-search-paths): Use 'for-each', 'search-path-definition', and
  'evaluate-search-paths' instead of 'for-each-search-path'.

environment: Use 'evaluate-search-paths'.

This allows 'guix environment' to correctly handle non-directory
and/or pattern search-path specifications, such as that for
'XML_CATALOG_FILES'.

* guix/scripts/environment.scm (for-each-search-path): Use
  'evaluate-search-paths' instead of 'search-path-as-list' & co.

search-paths: Define the 'PATH' environment variable.

* guix/search-paths.scm ($PATH): New variable.
* guix/scripts/environment.scm (for-each-search-path): Use it.

search-paths: 'evaluate-search-paths' can be passed a list of directories.

* guix/search-paths.scm (evaluate-search-paths): Change 'directory' to
  'directories', and adjust 'search-path-as-list' accordingly.
* guix/scripts/package.scm (search-path-environment-variables): Adjust
  call accordingly.