Makefile: simplify; clean should remove images created #42
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The target all was previous running setup followed by build. As both setup and build are phony targets they run in sequence and because the firmware contain the timestamp they always run (dependencies doesn't do anything). all now does exactly what it says on the tin without introducing non-standard targets.
clean should remove the images that created during build which is what you expect from that target. See:
https://www.gnu.org/software/make/manual/html_node/Standard-Targets.html#Standard-Targets