gnu: Add ruby-netrc.

* gnu/packages/ruby.scm (ruby-netrc): New variable.

gnu: Add ruby-guard.

* gnu/packages/ruby.scm (ruby-guard): New variable.

gnu: ruby-listen: Add rb-fsevent to inputs.

* gnu/packages/ruby.scm (ruby-listen)[propagated-inputs]: Add
  "ruby-rb-fsevent".

gnu: Add ruby-rb-fsevent.

* gnu/packages/ruby.scm (ruby-rb-fsevent): New variable.

gnu: Add ruby-saikuro-treemap.

* gnu/packages/ruby.scm (ruby-saikuro-treemap): New variable.

gnu: Add ruby-json-pure.

* gnu/packages/ruby.scm (ruby-json-pure): New variable.

gnu: Add ruby-utils.

* gnu/packages/ruby.scm (ruby-utils): New variable.

gnu: Add ruby-pstree.

* gnu/packages/ruby.scm (ruby-pstree): New variable.

gnu: Add ruby-term-ansicolor.

* gnu/packages/ruby.scm (ruby-term-ansicolor): New variable.

gnu: Add ruby-minitest-tu-shim.

* gnu/packages/ruby.scm (ruby-minitest-tu-shim): New variable.

gnu: Add ruby-gem-hadar.

* gnu/packages/ruby.scm (ruby-gem-hadar): New variable.

gnu: Add ruby-minitest-4.

* gnu/packages/ruby.scm (ruby-minitest-4): New variable.

gnu: bluez: Update to 5.36.

* gnu/packages/linux.scm (bluez): Update to 5.36.
[source]: Remove patch.
* gnu/packages/patches/bluez-tests.patch: Remove file.
* gnu-system.am (dist_patch_DATA): Remove it.

gnu: powertop: Update to 2.8.

* gnu/packages/linux.scm (powertop): Update to 2.8.

gnu: Add python-contextlib2.

* gnu/packages/python.scm (python-contextlib2, python2-contextlib2):
  New variables.

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

gnu: gcc-5: Update to 5.3.0.

* gnu/packages/gcc.scm (gcc-5): Update to 5.3.0.

gnu: Add redshift.

* gnu/packages/xdisorg.scm (redshift): New variable.

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

gnu: Add modem-manager.

* gnu/packages/freedesktop.scm (modem-manager): New variable.

gnu: Add libqmi.

* gnu/packages/freedesktop.scm (libqmi): New variable.

gnu: Add libmbim.

* gnu/packages/freedesktop.scm (libmbim): New variable.