gnu: orc: Update to 0.4.27.

* gnu/packages/gstreamer.scm (orc): Update to 0.4.27.

gnu: imagemagick: Update to 6.9.9-0.

* gnu/packages/imagemagick.scm (imagemagick): Update to 6.9.9-0.

locale: Demonadify the locale creation API.

* gnu/system/locale.scm (single-locale-directory): Use 'computed-file'
instead of 'gexp->derivation'.
(locale-directory): Adjust accordingly and do the same.
* gnu/system.scm (operating-system-directory-base-entries): Adjust
accordingly.

gnu: Remove glibc@2.21 and its traces.

* gnu/packages/base.scm (glibc-2.21): Remove.
* gnu/system/locale.scm (localedef-command)[maybe-version-directory]:
Remove.  Replace call with use of 'package-version'.
(single-locale-directory): Remove 'version>=' conditional.

gexp: 'ungexp-splicing' properly accounts for nested native inputs.

Previously, (gexp-native-inputs #~#$@(list #~#+foo)) would return '().

This is a followup to 5b14a7902c58d9fb7923f9e16871f549fbe59b6e.

* guix/gexp.scm (gexp-inputs)[add-reference-inputs]: In the list case,
remove 'if' around 'fold-right'.  In 'map' lambda, always inherit N?.
* tests/gexp.scm ("gexp list splicing + ungexp-splicing"): New test.

gnu: screen: Update to 4.6.1.

* gnu/packages/screen.scm (screen): Update to 4.6.1.

build, vm: Use a less common label.

* gnu/build/vm.scm (initialize-hard-disk): Use "GuixSD_image" as label.
* gnu/system/install.scm (installation-os): Likewise.
* gnu/system/vm.scm (system-disk-image): Likewise.

gnu: emacs-ahungry-theme: Upgrade to 1.4.0.

* gnu/packages/emacs.scm (emacs-ahungry-theme): Upgrade to 1.4.0.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: dash: Use the release tarball.

* gnu/packages/shells.scm (dash)[source]: Use the release tarball
instead of a Git checkout.
[native-inputs]: Remove field.
[arguments]: Remove 'bootstrap' phase.

gnu: font-wqy-zenhei: Use 'font-build-system'.

* gnu/packages/fonts.scm (font-wqy-zenhei): Switch to font-build-system.

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

gnu: font-wqy-microhei: Use 'font-build-system'.

* gnu/packages/fonts.scm (font-wqy-microhei): Switch to font-build-system.

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

gnu: Add Poly/ML.

* gnu/packages/sml.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

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

daemon: Flush the sink upon 'exportPath' errors.

Prior to this change, errors such as wrong permissions on
/etc/guix/signing-key.sec would give:

  guix-daemon: nix/libutil/serialise.cc:15: virtual nix::BufferedSink::~BufferedSink(): Assertion `!bufPos' failed.

This patch correctly propagates the error to the client and thus changes
that to:

  error: build failed: file `/etc/guix/signing-key.sec' should be secret (inaccessible to everybody else)!

* nix/nix-daemon/nix-daemon.cc (performOp): Wrap 'exportPath' call in
'try' block.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu: supertuxkart: Fix build on aarch64.

* gnu/packages/games.scm (supertuxkart)[source]: Add patch.
* gnu/packages/patches/supertuxkart-angelscript-ftbfs.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu: Add sooperlooper.

* gnu/packages/patches/sooperlooper-build-with-wx-30.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/music.scm (sooperlooper): New variable.

gnu: texlive-union: Silence union-build.

* gnu/packages/tex.scm (texlive-union)[arguments]: Suppress the output of
"union-build".

gnu: Add texlive-latex-type1cm.

* gnu/packages/tex.scm (texlive-latex-type1cm): New variable.

gnu: Add texlive-fonts-txfonts.

* gnu/packages/tex.scm (texlive-fonts-txfonts): New variable.

gnu: Add texlive-latex-enumitem.

* gnu/packages/tex.scm (texlive-latex-enumitem): New variable.

gnu: texlive-dvips: Install font maps.

* gnu/packages/tex.scm (texlive-dvips)[native-inputs]: Add dvips-font-maps and
dvips-base-enc.
[arguments]: Install them.