Part of the tiered storage change in WT-7113, included a change to always rebuild prototypes during a build.  That requires PYTHON to be set (the dist/prototypes.py is the prototypes rebuild script).  And PYTHON is only set in the Makefile if --enable-python is configured.  So some simple test build runs failed because of this.

This ticket will remove that change to the make system, it logically isn't part of the tiered storage work.