Preventing exponential invocations of abe

Follow the process mentioned in this content to prevent exponential invocations of abe.

clearmake does not pass the -J (parallel build) flag to child make processes involved in a recursive build. But if you explicitly instruct the child make processes to build parallel, and if the idleness in the build host and the bldserver.control files does not prevent it, then the build runs the risk of starting more total abes than you want or than the build servers can handle.

To prevent a build of makefile from contributing abes, use the .NOTPARALLEL special makefile target.