Fix RunCMake.FPHSA BadFoundVar stderr match

Do not assume the source tree is named "CMake".
FPHSA: Convert FOUND_VAR failure test to RunCMake

Move the Tests/FPHSA_InvalidFOUND_VAR test case over to a new
RunCMake.FPHSA test with a BadFoundVar case.  The RunCMake tests are
built to cover failure cases easily and robustly.
Merge topic 'FPHSA_FOUND_VAR_OPTION' into next

9a94a53 Fix RunCMake.FPHSA BadFoundVar stderr match
Merge branch 'FPHSA_FOUND_VAR_OPTION' into next

* FPHSA_FOUND_VAR_OPTION:
  FPHSA: Convert FOUND_VAR failure test to RunCMake