utils: Add 'every*'.

* guix/build/gnu-build-system.scm (every*): Move to...
* guix/build/utils.scm (every*): ... here.  New procedure.

gnu: gettext: Upgrade to 0.19.6.

* gnu/packages/gettext.scm (gnu-gettext): Update to 0.19.6.

gnu: coreutils: Use upstream's fix for 'tail'.

* gnu/packages/patches/coreutils-racy-tail-test.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.
* gnu/packages/base.scm (coreutils)[source]: Replace this patch with
  upstream's fix for 'tail'.

gnu: glibc: Do not abort when incompatible locale data is found.

* gnu/packages/patches/glibc-locale-incompatibility.patch: New file.
* gnu/packages/base.scm (glibc)[source]: Use it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: pixman: Update to 0.32.8.

* gnu/packages/xdisorg.scm (pixman): Update to 0.32.8.
* gnu/packages/patches/pixman-pointer-arithmetic.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.

gnu: libc: Look for locale data under /run/current-system/locale/X.Y.

* gnu/packages/base.scm (glibc)[arguments]: Append VERSION to
  'libc_cv_localedir'.
* gnu/system/locale.scm (localedef-command): Write to the sub-directory
  called (package-version libc) in #$output.
  (locale-directory): Create said directory.
* doc/guix.texi (Locales): Mention the per-version sub-directory.

gnu: Add gzochi.

* gnu/packages/game-development.scm (gzochi): New variable.

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

gnu: Add pigz.

* gnu/packages/compression.scm (pigz): New variable.

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

gnu: lsh: 'lsh-authorize' uses the absolute file name of 'sexp-conv'.

Fixes <http://bugs.gnu.org/21516>.
Reported by Andreas Enge <andreas@enge.fr>.

* gnu/packages/lsh.scm (lsh)[arguments]: In 'pre-configure' phase,
  change 'src/lsh-authorize' to use the absolute file name of
  'sexp-conv'.

guix gc: Add '--list-failures' and '--clear-failures'.

Suggested by Mark H Weaver <mhw@netris.org>.

* guix/scripts/gc.scm (show-help, %options): Add --list-failures and
  --clear-failures.
  (guix-gc): Honor them.
* doc/guix.texi (Invoking guix gc): Document them.
  (Invoking guix-daemon): Mention them.

store: Add 'query-failed-paths' and 'clear-failed-paths' RPCs.

Suggested by Mark H Weaver <mhw@netris.org>.

* guix/store.scm (query-failed-paths, clear-failed-paths): New
  procedures.
* tests/guix-daemon.sh: Add test with daemon started with
  --cache-failures.

tests: 'open-connection-for-tests' takes an optional parameter.

* guix/tests.scm (open-connection-for-tests): Add optional FILE
  parameter; pass it to 'open-connection'.

gnu: Add bio-blastxmlparser.

* gnu/packages/bioinformatics.scm (bio-blastxmlparser): New variable.

gnu: Add r-data.table.

* gnu/packages/statistics.scm (r-data.table): New variable.

gnu: Add r-chron.

* gnu/packages/statistics.scm (r-chron): New variable.

gnu: Add r-servr.

* gnu/packages/web.scm (r-servr): New variable.

gnu: Add r-jsonlite.

* gnu/packages/web.scm (r-jsonlite): New variable.

gnu: Add r-httpuv.

* gnu/packages/web.scm (r-httpuv): New variable.

doc: Fix spelling.

This is a followup to commit ba7d6c763c6adac4cf26fef656c7f98296601d0b.

* doc/guix.texi (Synopses and Descriptions): Fix spelling.

lint: Fix 'check-texinfo-markup'.

Fixes a regression introduced in 5d8d8f3.

* guix/scripts/lint.scm (check-description-style): When no exception is
  thrown in 'check-texinfo-markup', return the rendered description.