MPD sometimes uses version numbers like "0.22~git" to mark unreleased
versions.  That makes the win32 resource compiler unhappy, because it
expects numbers only.

So long, autotools!  This is my last MPD related project to migrate
away from it.  It has its strengths, but also very obvious weaknesses
and weirdnesses.  Today, many of its quirks are not needed anymore,
and are cumbersome and slow.  Now welcome our new Meson overlords!