[ide] ide_slave doesnt't need to capture stdout
[ide] ide_slave doesnt't need to capture stdout

The miscellaneous `msg_*` cleanup patches have finally enforced this
invariant.

Matafou/coq,letouzey/coq-wip,Zimmi48/coq,amintimany/coq,coq/coq,amintimany/coq,maximedenes/coq,Matafou/coq,gares/coq,amintimany/coq,maximedenes/coq,coq/coq,letouzey/coq-wip,coq/coq,ejgallego/coq,SkySkimmer/coq,Ptival/coq,gares/coq,JasonGross/coq,ppedrot/coq,william-lawvere/coq,SkySkimmer/coq,SkySkimmer/coq,ejgallego/coq,Lionel-Rieg/coq,Matafou/coq,Lionel-Rieg/coq,Zimmi48/coq,maximedenes/coq,JasonGross/coq,letouzey/coq-wip,ejgallego/coq,gares/coq,letouzey/coq-wip,silene/coq,coq/coq,gares/coq,ppedrot/coq,JasonGross/coq,ppedrot/coq,Zimmi48/coq,ppedrot/coq,william-lawvere/coq,silene/coq,Ptival/coq,ppedrot/coq,JasonGross/coq,ejgallego/coq,gares/coq,Zimmi48/coq,maximedenes/coq,letouzey/coq-wip,william-lawvere/coq,Lionel-Rieg/coq,maximedenes/coq,SkySkimmer/coq,silene/coq,Ptival/coq