common.mk: fix clean target to remove binaries, not source directories #183
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The clean target was using
rm -rf ./cmd/$(APP)which deletes the entire source directory. Sincego build ./cmd/$(APP)outputs the binary to the current directory (not intocmd/), clean should remove./$(APP)instead.This prevents accidental deletion of customized
cmd/files (like the streaming example'shttp.gowithpingPonger) when runningmake clean && make.