build -clean doesn't clean

[cgay]

Open Dylan 2019.1

I expect a "clean" build to completely ignore any previous build products.

cd ${DYLAN}/ws.all && dylan-compiler -build -clean testworks-test-suite-app

Internal error: Assertion failed: Dylan database/compiler version mismatch
Exiting with return code -1

I had previously built this target with a master branch compiler.