Note: this only affects internal testing systems. 

The system_perf.yml file support for enterprise modules is doing the wrong thing for non-enterprise builds. There are three compile tasks in one variant, but they all get the enterprise module. The fix seems to be making the enterprise build more like the wtdevelop build, by checking out the enterprise module to a directory outside the mongo source directory, and actively copying it in for the enterprise build as is done in "use wiredtiger develop" function.