tmux: install bash completion
qemu: add sdl2 opt; replace sdl1 opt with sdl and make it the default.
python3.4: remove references to cross toolchain.
tidy up vopt helpers
add vopt_conflict helper

vopt_conflict prints an error and exits if two options are set at the
same time.
qemu: options sdl and sdl2 conflict with each other
runit-void: bump (new services).
runit-void: fixing statd and nfs-server.
Put .mkshrc in the right place (functions, aliases)
nfs-utils: Update to 1.3.0.
nfs-utils: fix segfault on mount.
nfs-utils: revbump.
New package: python-Sphinx-1.2.3
xbps-git: revbump (performance improvements).
runit-void: revbump (twerks).
runit-void: revbump (new services).
linux3.16: update to 3.16.2.
linux3.14: update to 3.14.18.
Merge pull request #538 from uggedal/tmux-bash-completion

tmux: install bash completion
wine: update to 1.7.26.