Fix setting CTEST_BUILD_FLAGS for ctest -S driver (TRIL-171)
Created by: bartlettroscoe
This is needed so that the ctest -S drvier with ninja will have '-k 99999' passed in to show all build errors, which we want for ctest -S builds and submits to CDash.
See the comment in the file in the commit for more details.
This is needed so that ATDM Trilinos builds show all of their errors.
I tested this locally with the Jenkins driver and I say that the '-k 99999' argument is included.