Use `# min-llvm-version: 11.0` to force a minimum LLVM version, rather than ad-hoc internal solution.

In particular: the specific code to define LLVM_VERSION_11_PLUS here was, for
some reason, using `$(shell ...)` with bash-specific variable replacement code.
On non-bash platforms like dash, that `shell` invocation would fail, and the
LLVM_VERSION_11_PLUS check would always fail, the test would always be ignored,
and thus be treated as a "success" (in the sense that `--bless` would never do
anything).

This was causing me a lot of pain.

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