`cargo test` with various features fails in mcuboot-sys

[d3zd3z]

I discovered, while adding a top-level virtual Cargo.toml file, that cargo test fails to build in mcuboot-sys with some feature combinations. Some quick investigation more makes me wonder why this works at all, as there are some duplicate source files include. It is unclear why, but the link order seems important within mcuboot-sys, whereas it doesn't when linking packages that depend upon it.

This isn't particularly high priority, as there is no strong reason to run these tests (there are no tests, it is just about compilation and linking). But, since the top-level virtual package does include these, it would be nice to have them at least able to link.

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[d3zd3z]

Moving to someday to consider as a possible improvement. Proper linker flags allow us to continue to build even with objects included more than once.