Disable quartus_sh message output buffering

Hi sstrell,

My organization uses Jenkins for regression testing and our default Jenkins configuration checks the output log every 15 minutes or so, and if there is no activity (i.e. no stdout/stderr) then it marks the job as a timeout failure. It's easy to disable this config feature but generally I would prefer to not have special exceptions for our FPGA regression.

I am well aware that the logs contain all of the information, and where the logs are located.