tests: allow Google's internal builds of clang-format to be used These builds do not actually include any Google-specific formatting changes; the only reason they don't include the LLVM version number is due to a decision to elide the version number from *all* LLVM/clang projects. For most builds of clang-format, even "unofficial" ones, the LLVM version will be displayed; example: ``` clang-format version 14.0.0 (https://github.com/llvm/llvm-project.git 1830ec94ac022ae0b6d6876fc2251e6b91e5931e) ``` The Google-internal build looks like this: ``` clang-format version google3-trunk (1830ec94ac022ae0b6d6876fc2251e6b91e5931e) ``` Differential Revision: https://phab.mercurial-scm.org/D10538

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#require rustfmt test-repo

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  $ . "$TESTDIR/helpers-testrepo.sh"

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  $ cd "$TESTDIR"/..

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  $ RUSTFMT=$(rustup which --toolchain nightly-2020-10-04 rustfmt)

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  $ for f in `testrepohg files 'glob:**/*.rs'` ; do

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  >   $RUSTFMT --check --edition=2018 --unstable-features --color=never $f

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  > done