Tests: Disable test that builds KWSys if not also building CMake
If `CMake_TEST_EXTERNAL_CMAKE` is enabled then the compiler with which we are driving tests may not be able to compile CMake, so do not try to compile KWSys with it either.
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If `CMake_TEST_EXTERNAL_CMAKE` is enabled then the compiler with which we are driving tests may not be able to compile CMake, so do not try to compile KWSys with it either.
mentioned in commit 49a53cac
·mentioned in commit 49a53cac