audio/pulseaudio-module-sndio: unbreak module version again

Either pkgconfig or pulseaudio may not be available during patch phase.
For example, poudriere shows the following:

/bin/sh: /usr/local/bin/pkg-config: not found

PR: 280857
(cherry picked from commit 060f5301747fc31ed67f0fef2c94d10c97405e15)