Initial support for Void Linux

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

contrib/void/README.md

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+HowTo: Finit on Void Linux 3.4-3.6
+====================================
+
+HowTo use Finit to boot an [Void Linux][] system.  It is assumed that
+the user has already installed make, a compiler, C library header files,
+and other tools needed to build a GNU configure based project.
+
+To start with you need to first install [libuEv][] and [libite][].  They
+default to install to `/usr/local`, but unlike Debian and Ubuntu based
+distros, Void's `pkg-config` does not look for libraries and header
+files there.  So the `PKG_CONFIG_LIBDIR` environment variable must be
+used, or change the install prefix to `/usr`.
+
+The bundled [build.sh](build.sh) script can be used to configure and
+build finit:
+
+    void:~# cd finit
+    void:~/finit# ./contrib/void/build.sh
+
+Then run the [install.sh](install.sh) script to install all necessary
+files, including the sample `finit.conf` and `finit.d/*.conf` files.
+More on that below.
+
+    void:~/finit# ./contrib/void/install.sh
+
+The install script is non-destructive by default, you have to answer
+*Yes* twice to set up Finit as the system default init.  Pay close
+attention to the last question:
+
+    *** Install Finit as the system default Init (y/N)?
+
+If you answer `No`, simply by pressing enter, you can change the symlink
+yourself later on, to point to `finit` instead of `/bin/busybox`:
+
+    void:~/finit# cd /sbin
+    void:/sbin# rm init
+    void:/sbin# ln -s finit init
+
+Before rebooting, make sure to set up a [/etc/finit.conf](finit.conf),
+and [/etc/finit.d/](finit.d/) for your services.  Samples are included
+in this directory.  Notice the symlinks in `/etc/finit.d/`, which can be
+managed by the operator at runtime using `initctl enable SERVICE`.  You
+can also use a standard [/etc/rc.local](rc.local) for one-shot tasks and
+initialization like keyboard language etc.
+
+[libuEv]: https://github.com/troglobit/libuev
+[libite]: https://github.com/troglobit/libite
+[Void Linux]: https://www.voidlinux.eu/