FENNEL:  don't attempt to link libaio if not present
FENNEL:  don't attempt to link libaio if not present

[git-p4: depot-paths = "//open/dev/": change = 12771]

LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb