gnu: pciutils: Update to 3.5.5.

* gnu/packages/pciutils.scm (pciutils): Update to 3.5.5.

gnu: wget: Update comment about test failures.

* gnu/packages/wget.scm (wget)[arguments]: Update comment.

gnu: libsoup: Adjust to new GnuTLS certificate-check behavior.

* gnu/packages/gnome.scm (libsoup)[arguments]: Add #:modules.
In 'pre-check' phase, invoke 'certtool'.
[native-inputs]: Add GNUTLS.

gnu: libsoup: Reindent.

* gnu/packages/gnome.scm (libsoup): Reindent.

gnu: groff: Remove dependency on netpbm.

* gnu/packages/groff.scm (groff)[inputs]: Remove 'netpbm'.

gnu: wget: Fix compilation with Perl 5.26; skip faulty tests.

* gnu/packages/wget.scm (wget)[arguments]: New field.
[source](patches): Add "wget-perl-5.26.patch".
* gnu/packages/patches/wget-perl-5.26.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu: Add basic support for powerpc64le-linux-gnu targets.

* gnu/packages/bootstrap.scm (glibc-dynamic-linker): Add
"powerpc64le-linux".
* gnu/packages/linux.scm (system->linux-architecture): Add "powerpc"
prefix.
(system->defconfig): Add "powerpc64le-" prefix.

gnu: ghostscript: Don't write CreationDate and ModDate header entries.

Followup to a64b174751a9fa76375d35d2f2a47a4c93ce0206.

* gnu/packages/ghostscript.scm (ghostscript)[source]: Don't write CreationDate
and ModDate header entries.

gnu: netpbm: Remove timestamps.

Fixes <https://bugs.gnu.org/27567>.

* gnu/packages/netpbm.scm (netpbm)[source]: Remove timestamps.

gnu: ghostscript: Make build reproducible.

Fixes <https://bugs.gnu.org/27563>.

* gnu/packages/ghostscript.scm (ghostscript)[source]: Remove timestamps.

gnu: cups: Update to 2.2.4.

* gnu/packages/cups.scm (cups, cups-minimal): Update to 2.2.4.

gnu: cups-filters: Update to 1.14.1.

* gnu/packages/cups.scm (cups-filters): Update to 1.14.1.

gnu: mesa: Update to 17.1.4.

* gnu/packages/gl.scm (mesa): Update to 17.1.4.

gnu: glibc: Fix build on i686.

This is followup to 503a4df904b8d4b82caebdb17db9c5f76a952418.
Fixes <https://bugs.gnu.org/27489>.

* gnu/packages/base.scm (glibc/linux): Add
"glibc-vectorized-strcspn-guards.patch" to patches.

system: Avoid collision between GMP variants in the global profile.

* gnu/system.scm (%base-packages): Move GUILE-2.2 out of the list passed
to 'canonical-package'.

Merge branch 'master' into core-updates

system: Use "@" to refer to the 'shadow' package.

Reported by Mark H Weaver
at <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00349.html>.

* gnu/system.scm (%base-packages): Use '@' for shadow.  This fixes an
error on Guile 2.0 where 'shadow' alone resolves to the (gnu system
shadow) module.

gnu: shishi: Build with latest libgcrypt.

* gnu/packages/patches/shishi-fix-libgcrypt-detection.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/kerberos.scm (shishi)[source]: Use it.
[inputs]: Use libgcrypt instead of libgcrypt-1.5.
[arguments]: Set 'ac_cv_libgcrypt=yes' in #:configure-flags.
* gnu/packages/gnupg.scm (libgcrypt-1.5): Remove variable.

gnu: poppler: Integrate grafted update.

* gnu/packages/pdf.scm (poppler): Update to 0.56.0.
[replacement]: Remove field.
(poppler-qt4, poppler-qt5): Use (inherit) instead of (package/inherit).

gnu: libgcrypt: Integrate grafted update.

* gnu/packages/gnupg.scm (libgcrypt): Update to 1.7.8.
[replacement]: Remove field.
(libgcrypt-1.7.8): Remove variable.
(libgcrypt-1.5)[replacement]: Remove field.