[compiler-rt] Fix build race with COMPILER_RT_TEST_STANDALONE_BUILD_LIBS

Since this standalone build configuration uses the runtime libraries that
are being built just now, we need to ensure that e.g. the TSan unit tests
depend on the tsan runtime library. Also fix TSAN_DEPS being overridden
to not include the tsan runtime (commit .....).
This change fixes a build race seen in the CI checks for
TsanRtlTest-x86_64-Test in https://github.com/llvm/llvm-project/pull/83088.

Reviewed By: vitalybuka

Pull Request: https://github.com/llvm/llvm-project/pull/83650