A variable XTRADB_PREFER_STATIC_LIBAIO should be set to 1 (or TRUE
 or ON) for static linking.

Even if mysqld can avoid dependency on shared libaio, shared libraries 
libmysqld.so or ha_innodb.so cannot link without it.

Given that the patch primarily addresses building tar.gz package, and 
shared libraries mentioned above deemed less important than mysqld
executable, we accept shared lib dependency on libaio.so