Seems like there is no way to exclude streams from the 'build strategies'. I had originally set up my multibranch pipeline job to build all streams. We now want to exclude some specifically named streams but this doesn't seem to be possible by using a regular expression for a named branch and choosing 'None Strategies Match'. See screenshot.
After adding this to my multibranch config, the stream 'OBSOLETE - int_2.0.2' still shows up as a job and still attempts to run. The multibranch config is setup to discard old items.
A system configured as above should remove the job from list of jobs in the multibranch pipeline.