[cmake] Forward MacOS sysroot to runtimes when not crosscompiling (#182501) The LLVM build documentation says that setting CMAKE_OSX_SYSROOT should be sufficient to correctly configure the sysroot, however this flag was not forwarded to the build of runtimes: leading to failures in flang-rt tests. https://llvm.org/docs/CMake.html#apple-osx It is not safe to forward this flag in general because the runtime might be cross-compiled. In this case I have tried to do this only for native builds. My intention here is not to make the build more complex than currently documented.
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