Test: allow different deployment target versions for tests on Darwin #83464
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Currently we are using the same versions we use to build compiler and
standard library. This is an unnecessary coupling especially when
testing the generation of backdeployed executables for macOS -- here
we have interest in being able to run the tests on previous OSes, not
the compiler itself.
To support this, add new
--darwin-test-deployment-version-<platform>
flags to build-script, which by default take the same value as the
matching
--darwin-deployment-version-<platform>
ones.Piggyback a change to not require CMake to be in the search path for build-script tests
Addresses rdar://156724078