test-limits: improve test without target

test-limits: improve test without target

When there is no target available, the unit test would fail with a
non-fatal error (because emulation would be done). The non-fatal error
would however not be overwritten by the real error when we exceed the
limits.

First relax the first compilation test to check for FATAL errors. Then
reset the program (and clear any non-fatal errors) before triggering
the next error.