gnu: audacity: Fix building on non-Intel systems.

* gnu/packages/audio.scm (audacity)[arguments]: On non-Intel systems add
a configure-flag to disable SSE optimizations.

gnu: nss, nss-certs: Update to 3.34.

* gnu/packages/certs.scm (nss-certs): Update to 3.34.
* gnu/packages/gnuzilla.scm (nss): Update to 3.34.

gnu: bitcoin: Update to 0.15.1.

* gnu/packages/finance.scm (bitcoin-core): Update to 0.15.1.

gnu: strace: Update to 4.20.

* gnu/packages/linux.scm (strace): Update to 4.20.

gnu: samba: Update to 4.7.2.

* gnu/packages/samba.scm (samba): Update to 4.7.2.

gnu: tevent: Update to 0.9.34.

* gnu/packages/samba.scm (tevent): Update to 0.9.34.

Update email address for ng0.

gnu: Patch ikiwiki to set PERL5LIB in the CGI wrapper.

This helps with CGI support.

* gnu/packages/web.scm (ikiwik)[arguments]: Add 'include-PERL5LIB-in-wrapper
  phase.

gnu: nano: Update to 2.9.0.

* gnu/packages/nano.scm (nano): Update to 2.9.0.

gnu: owncloud-client: Update to 2.3.4.

* gnu/packages/sync.scm (owncloud-client): Update to 2.3.4.

gnu: owncloud-client: Don't check for updates.

* gnu/packages/sync.scm (owncloud-client)[source]: Add patch.
* gnu/packages/patches/owncloud-disable-updatecheck.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu: libreoffice: Remove GTK+ 2.

LibreOffice doesn't need to use both GTK+ 2 and GTK+ 3.

* gnu/packages/libreoffice.scm (libreoffice)[inputs]: Remove gtk+-2.
[configure-flags]: Add "--disable-gtk".

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

gnu: libassuan: Update to 2.4.4.

* gnu/packages/gnupg.scm (libassuan): Update to 2.4.4.

gnu: mes: Update to 0.11.

* gnu/packages/mes.scm (mes): Update to 0.11.

gnu: audacity: Update to 2.2.0.

* gnu/packages/patches/audacity-build-with-system-portaudio.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/audio.scm (audacity): Update to 2.2.0.
[source]: Add patch to build with system portaudio; add snippet to remove most
bundled libraries.
[inputs]: Replace "gtk+-2" with "gtk+", replace "wxwidgets-gtk2" with
"wxwidgets"; remove "libsbsms"; add "suil" and "portmidi".
[arguments]: Adjust configure flags to avoid using bundled libraries; remove
phase "autoreconf"; add phases "fix-sbsms-check" and "use-upstream-headers".

gnu: java-mail: Let build phase return boolean.

* gnu/packages/java.scm (java-mail)[arguments]: Let build phase
"move-version.java" return #t.

gnu: bitshuffle-for-snappy: Simplify.

* gnu/packages/compression.scm (bitshuffle-for-snappy)[arguments]: Simplify
Makefile generation.

gnu: bitshuffle: Let build phase return #t.

* gnu/packages/compression.scm (bitshuffle)[arguments]: Let
"make-required-dir" return #t.

gnu: python-pylast: Update to 2.0.0.

* gnu/packages/music.scm (python-pylast): Update to 2.0.0.
[native-inputs]: Add python-pycodestyle and python-flaky.

gnu: Move date/time packages from python.scm to time.scm.

* gnu/packages/python.scm (python-pytz, python2-pytz, python-dateutil,
python2-dateutil, python-parsedatetime, python2-parsedatetime,
python-tzlocal, python-isodate, python2-isodate, python-iso8601,
python2-iso8601, python-monotonic, python2-monotonic, python-pyrfc3339,
python2-pyrfc3339, python-arrow, python2-arrow, python-aniso8601,
python2-aniso8601): Move from here...
* gnu/packages/time.scm: ...to here.
* gnu/packages/calendar.scm,
gnu/packages/check.scm,
gnu/packages/django.scm,
gnu/packages/ebook.scm,
gnu/packages/gnome.scm,
gnu/packages/irc.scm,
gnu/packages/jrnl.scm,
gnu/packages/mail.scm,
gnu/packages/openstack.scm,
gnu/packages/package-management.scm,
gnu/packages/python-crypto.scm,
gnu/packages/python-web.scm,
gnu/packages/rdf.scm,
gnu/packages/statistics.scm,
gnu/packages/tls.scm,
gnu/packages/tryton.scm,
gnu/packages/version-control.scm: Adjust accordingly.