RFR: JDK-8047083,Need to use -fPIC flag for native DIO build

[Jen Dority]

issue: https://bugs.openjdk.java.net/browse/JDK-8047083
webrev: http://cr.openjdk.java.net/~jld/8047083/webrev/

Hi,

This is a small change to correct the compiler flags for the DIO native 
build.

Thanks,
Jen