lint

make: Add phony `rtl` target #2114

Job	Run time
Check bender vendor up-to-date	9s
Check Opcodes Up-to-Date	5s
Lint C/C++ Sources	11s
Check License headers	5s
Lint Editorconfig	7s
Lint Python Sources	6s
Lint Verilog sources	44s
Lint YAML Sources	6s
	1m 33s

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