Previously we only allowed to download clang when doing GPU builds. The added skylark files use bazel's autoconf scripts, which were only added in 0.10.0. To provide nice error message for older versions of bazel (i.e. 'version is less than 0.10' vs 'can't load @bazel_tools/cpp/...'), we move the bazel version check into WORKSPACE file from workspace.bzl. PiperOrigin-RevId: 190050798
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Python
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Python