Look into module version checks

[gabcoh]

My default archlinux pulseaudio daemon has no problem loading a module with any PA_MODULE_VERSION set but my pulseaudio built from source refuses to load the module if the version is not MODULE_VERSION. I need to look into what is causing this (is it just a new feature?) and if it is a problem on actual platforms. If the version is checked on other platforms we can probably live patch the module based on pulseaudio --version but ideally that won't be necessary.