EPE-135 Non Windows OS assumes server is installed

Non windows OS automatically adds /opt/HPCCSystems/bin/eclcc to list of known compilers.

Fixes EPE-135

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #174 from GordonSmith/EPE-135

EPE-135 Non Windows OS assumes server is installed

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>