Fix replace-rtl ordering problem

[nandor]

Not all sub-rules build the directory and replace-rtl failed if trying to copy the driver first.

Related PRs / Issues

UI / API Impact

Verilog / AGFI Compatibility

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[timsnyder-siv]

$(fpga_build_dir) $(fpga_driver_dir) $(verif_dir) $(repo_state):
        mkdir -p $@

$(fpga_driver_dir)/$(DESIGN)-$(PLATFORM): $($(PLATFORM)) | $(fpga_driver_dir)
	cp -f $< $@

This can be avoided by factoring the directory into it's on order-only dep. What you've done is fine to make forward progress but it would probably be better to factor the mkdir out into a pattern rule with clear deps defined.