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Make: fix incremental builds, add build tests Four semi-related build changes in one: * Add basic tests for make system sanity (can be expanded as we find corner cases) * Fix incremental building of bootloader when source files change * Don't regenerate component libraries or re-link the ELF file if nothing changed * Rename `$(vecho)` to `$(summary)` and add a new `$(details)` macro to echo some helpful build details when V=1. See merge request !20