Fix bug in including all source files to dist package independently of current build options.
Fix bug in including all source files to dist package independently of current build options.

jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2