common.mk: `make check` now includes `make test-tool`

And `make test-tool` includes `make test-testframework`.

This change may be arguable because I'm unsure who is an intended user
of `make check`: a normal user, or Ruby-core developer.  Normal users
don't have to run `make test-tool` for testing their installation, but
Ruby committers should run it before they commit anything.

In this case, I'd be conservative; `make check` includes `test-tool`.
If normal users often report a failure of `make test-tool`, then we can
consider to split `make check` for two sets of target users.

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