change rmw_implementation deps to be buildtool and not exec

[wjwwood]

Discovered this while going over dependencies again with @chapulina. I think it should be build tool and not exec.

[ahcorde]

Can you reorder these two new lines to follow the schema order ?

[wjwwood]

How do you mean? I think they are in that order? Do you mean move them above the lines around them? This package already has a mixture of depend and other tags, so I didn't try to reorder everything.

[dirk-thomas]

@wjwwood What is the status on this?

[wjwwood]

Sorry, this fell through the cracks. When you poked me originally, I hesitated to merge it now because I was worried it shouldn't go into foxy. But I can merge it and then decide if we should back port it. Any thoughts on if it should be back ported?

[dirk-thomas]

From a Debian point of view this is a no-op and (to my knowledge) we nowhere use these dependency types differently anywhere else. Therefore I don't mind if it does get backported or not.

[wjwwood]

@ahcorde can you re-review this?