add meson build files

Closes #116.
Closes #171.
Closes #172.
Closes #175.

scripts/meson_script_links.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -e
+set -u
+
+rc_libexecdir="$1"
+sbindir="$2"
+binaries=" halt poweroff rc-sstat reboot shutdown"
+for f in $binaries; do
+	if [ -x "${DESTDIR}${rc_libexecdir}/bin/${f}"  ]; then
+		ln -snf "${DESTDIR}${rc_libexecdir}/bin/${f}" \
+			"${DESTDIR}${sbindir}/${f}"
+	fi
+done