dev-lang/rust: don't try to delete new JSON target file

etc/target-spec-json-schema.json now gets installed by Rust but gets
caught by the sanity check we have for cleaning up bash-completion (which
gets handled by dev-lang/rust-common). It's now expected to have something
left in etc/, so cleanup the rmdir accordingly to just kill the bash-completion
dir.

Note that this JSON file doesn't seem appropriate for rust-common because:
1) it's generated (so would require us to build something to install it);
2) per the commit introducing it:
> Because the schema is subject to change, you should always use the schema
> from the version of rustc which you are passing the target to.
>
> The existence and name of this schema is, just like the properties of the
> JSON specification, not stable and subject to change.

Closes: https://bugs.gentoo.org/964416
Signed-off-by: Sam James <sam@gentoo.org>

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