Only build tests when we are the top level project #38
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sanitizers-cmake tests are being run when included as a sub-project.
Change Summary: When sanitizers-cmake is the top level project its tests will run by default. The can be turned off with "-DBUILD_TESTING=OFF". When sanitizers-cmake is not the top level project, its test will not run.
Added change as described in "An Introduction to Modern CMake" to only include tests when we are the top level project, as determined by CMAKE_PROJECT_NAME .
Use of Ctest defines cmake option BUILD_TESTING so users can turn testing on an off (defaults to ON, the same as the current sanitizers-cmake implementation). Note CTest calls enable_testing().