tests: Skip supported-crate-types test on musl hosts

This test depends on the target-specific behavior of crt-static for musl
targets. However, running the testsuite on a musl host requires
setting `crt-static` to `false`, as it wouldn't otherwise be possible to
build rustc. This in turn will enable `-Ctarget-feature=-crt-static` for
all tests, mismatching the expected `+crt-static` for the musl target
tested in this testcase.

Since this test specifically tests the default value of `crt-static` for
the musl target, ignoring it entirely makes more sense than manually
setting `-Ctarget-feature=+crt-static` here, but both would be valid
approaches.

Signed-off-by: Jens Reidel <adrian@travitia.xyz>

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