Force varnish to use the packaged pcc compiler for VCL compiling.
Force varnish to use the packaged pcc compiler for VCL compiling.

This is so we can package the much smaller and simpler pcc compiler with
the omnibus installer, rather than including the full gcc package and
other dependencies.

NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella-router,OdiloOrg/api-umbrella-router,apinf/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,NREL/api-umbrella-router,apinf/api-umbrella,NREL/api-umbrella-router,apinf/api-umbrella,OdiloOrg/api-umbrella-router,NREL/api-umbrella,OdiloOrg/api-umbrella-router