modules/rust: Specify the compiler version to bindgen when possible

bindgen by default may output code that an older rustc cannot
successfully consume. To avoid this, we check if bindgen supports the
rustc version we're using, if so, and if the user didn't set the
`--rust-target` option, we will supply it to ensure that bindgen writes
out code our rustc can use. If it does not support that version
explicitly, we leave it at the default, assuming that our compiler
version is newer than bindgen.

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