gnu: Move contents of zip module into compression module.

* gnu/packages/zip.scm (zip, unzip, zziplib, perl-zip): Move to...
* gnu/packages/compression.scm: ...here.
* gnu/packages/zip.scm: Delete file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Unregister deleted file.
* po/packages/POTFILES.in: Unregister deleted file.
* gnu/packages/{audio, avr, bioinformatics, busybox, cdrom, ci, compression,
docbook, documentation, fonts, fpga, game-development, games, gl, gnome,
gnuzilla, graphics, guile, haskell, image, java, kodi, ldc, libreoffice,
markup, maths, mc, monitoring, music, php, pretty-print, python, scheme,
smalltalk, statistics, synergy, tex, textutils, video, web-browsers, xml,
zip}.scm, guix/build-system/{ant, font}.scm, guix/{download, packages}.scm:
Adapt module import.

gnu: linux-libre-arm-generic: Add mitigation for CVE-2017-1000364.

This is a followup to commit 91c623aae0f10992aa46957b9072679534e4cd28.

* gnu/packages/linux.scm (linux-libre-arm-generic): Add patch to mitigate
CVE-2017-1000364.

gnu: giac-xcas: Update to 1.2.3-51.

* gnu/packages/algebra.scm (giac-xcas): Update to 1.2.3-51.

gnu: rustc: Enable tests.

* gnu/packages/rust.scm (rustc)[source]: Remove bundled llvm.
[native-inputs]: Add bison, flex, procps.
[inputs]: Update llvm to llvm-3.9.1.
[arguments]: Patch and enable tests.

gnu: guile@2.2: Increase max-silent-time to 10 hours.

* gnu/packages/guile.scm (guile-2.2)[properties]: Increase max-silent-time to
10 hours.

gnu: linux-libre: Add mitigation for CVE-2017-1000364.

This increases the stack guard gap size from one page to 1 MiB in
linux-libre-4.11, 4.9, and 4.4, to mitigate CVE-2017-1000364 (Stack Clash).

* gnu/packages/linux.scm (linux-libre, linux-libre-4.9, linux-libre-4.4): Add
patch.

gnu: exim: Update to 4.89.

* gnu/packages/mail.scm (exim): Update to 4.89.

gnu: exim: Fix CVE-2017-1000369.

* gnu/packages/patches/exim-CVE-2017-1000369.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/mail.scm (exim)[source]: Use it.

store: Buffer RPC writes.

For a command like:

  guix build python2-numpy -n

this reduces the number of 'write' syscalls from 9.5K to 2.0K.

* guix/store.scm (<nix-server>)[buffer, flush]: New fields.
(open-connection): Adjust accordingly.  Call 'buffering-output-port' to
compute the two new fields.
(write-buffered-output, buffering-output-port): New procedures.
(operation): Write to (nix-server-output-port server).  Call
'write-buffered-output'.

gnu: wireshark: Update to 2.2.7.

* gnu/packages/networking.scm (wireshark): Update to 2.2.7.

gnu: httpd: Update to 2.4.26 [fixes CVE-2017-7659].

* gnu/packages/web.scm (httpd): Update to 2.5.26.

gnu: glpk: Update to 4.62.

* gnu/packages/maths.scm (glpk): Update to 4.62.

gnu: certbot: Build with Python 3.

* gnu/packages/tls.scm (certbot): Use python-3 to build.
[native-inputs, propagated-inputs]: Use Python 3 variants of dependencies. Use
python-mock-2.

gnu: Add python-mock-2.

* gnu/packages/python.scm (python-mock-2): New variable.

gnu: enlightenment: Patch more hardcoded paths.

* gnu/packages/enlightenment.scm (enlightenment)[arguments]: Patch
hardcoded paths to mount, umount, eject, halt, reboot.
[native-inputs]: Add util-linux.

build-system/texlive: Update to texlive-2017.1, revision 44591.

* guix/build-system/texlive.scm (%texlive-tag): Change to texlive-2017.1.
(%texlive-revision): Change to 44591.

gnu: texlive-latex-l3packages: Update to revision 44591.

* gnu/packages/tex.scm (texlive-latex-l3packages): Update to revision 44591.

gnu: texlive-latex-l3kernel: Update to revision 44591.

* gnu/packages/tex.scm (texlive-latex-l3kernel): Update to revision 44591.

gnu: texlive-latex-graphics: Update to revision 44591.

* gnu/packages/tex.scm (texlive-latex-graphics): Update to revision 44591.

gnu: texlive-generic-ifxetex: Use %texlive-revision as version.

* gnu/packages/tex.scm (texlive-generic-ifxetex)[version]: Change to
%texlive-revision.