Do not erase native files in debug mode
Do not erase native files in debug mode

Being able to inspect the generated OCaml code is a useful debug tool.
It seems this was disabled by mistake in #11081.

silene/coq,JasonGross/coq,Zimmi48/coq,coq/coq,JasonGross/coq,gares/coq,Zimmi48/coq,gares/coq,gares/coq,coq/coq,JasonGross/coq,ejgallego/coq,gares/coq,SkySkimmer/coq,coq/coq,coq/coq,ejgallego/coq,SkySkimmer/coq,JasonGross/coq,SkySkimmer/coq,Zimmi48/coq,silene/coq,ejgallego/coq,ejgallego/coq,Zimmi48/coq,gares/coq,SkySkimmer/coq,silene/coq