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Flang's runtime can now be built using LLVM's LLVM_ENABLE_RUNTIMES mechanism, with the intent to remove the old mechanism in #124126. Update the pre-merge builders to use the new mechanism. In the current form, #124126 actually will add LLVM_ENABLE_RUNTIMES=flang-rt implicitly, so no change is strictly needed. I still think it is a good idea to do it explicitly and in advance. On Windows, flang-rt also requires compiler-rt, but which is not building on Windows anyway.