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Introduce the environment option CI_FORCE: * ci_verify_configure.sh is known to fail if an existing build configuration is found in the top-level directory. Setting CI_FORCE=1 will run `make distclean` before verification. * ci_verify_makefiles.sh cannot be reliably executed if random object files are found in the top-level directory. Setting CI_FORCE=1 will run `rm *.o *.obj` before verification. * ci_verify_cmake.sh is not known at this time to fail for similar reasons; but if it does, we will use CI_FORCE to trigger any necessary pre-build cleanup.