Check for posix_memalign in configure
Check for posix_memalign in configure

This function is not mandatory, but found on most systems
and needed to enable some performance optimization.

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