Pull request #621: CAS-13867: Clean up of #ifdef conditional compilations
Merge in CASA/casa6 from CAS-13867 to master
* commit '90ecc801d8f746353fe71ff2e00ee869c5e2690b':
Use latest master tags in build.conf
Update build.conf with the latest versions.
Use latest casaviewer wheel from branch
Add missing import to runtest
Update build.conf with tag from casaviewer branch.
Remove remaining #ifdef CASATOOLS guards.
Update build.conf with the latest tags
Remove superflous USE_GRPC.
Use <grpc++/ > rather than <grpcpp/ >
Remove INTERACTIVE_ITERATION ifdef
Use #ifdef USE_GRPC to guard the gRPC-dependant code.