Add missing dir to Vivado clean targets

I am not sure about removing srcs. If you create an IP with Vivado, it will be put into the srcs directory. And then make clean will remove it and you will loose the parameters you entered to create the IP.

How to avoid user mistakes ?

As long as the srcs directory already exists, Vivado will refuse to create the project when you run make project or make, so right now make clean leaves things in a broken state. make clean already deletes the xpr file, so you'll lose the rules to actually generate and synthesize the IP.

What's the expected workflow when using hdlmake with Vivado customized IP?

Yes, I agree. The user should know what he does.

merged

mentioned in commit 3e14acfc

mentioned in commit 58e0e7a6

mentioned in merge request !15 (merged)

mentioned in commit 9ed98b1b