Changed configure to apply native optimizations only on Linux
Changed configure to apply native optimizations only on Linux

- still enforcing native optimization on Linux, needs to be removed to produce distributable binaries

smarr/OmniVM,smarr/OmniVM,smarr/OmniVM,smarr/OmniVM,smarr/OmniVM,smarr/OmniVM,smarr/OmniVM,smarr/OmniVM