Explain new flags for native_compute in CHANGES.
Explain new flags for native_compute in CHANGES.

SkySkimmer/coq,Zimmi48/coq,Matafou/coq,Lionel-Rieg/coq,ejgallego/coq,barras/coq,Zimmi48/coq,silene/coq,herbelin/github-coq,jpdeplaix/coq,mattam82/coq,JasonGross/coq,Matafou/coq,Zimmi48/coq,ppedrot/coq,barras/coq,gares/coq,maximedenes/coq,JasonGross/coq,ejgallego/coq,letouzey/coq-wip,coq/coq,Zimmi48/coq,silene/coq,maximedenes/coq,Ptival/coq,SkySkimmer/coq,Ptival/coq,JasonGross/coq,ppedrot/coq,coq/coq,maximedenes/coq,Ptival/coq,gares/coq,mattam82/coq,ppedrot/coq,gares/coq,maximedenes/coq,letouzey/coq-wip,Lionel-Rieg/coq,william-lawvere/coq,barras/coq,ejgallego/coq,letouzey/coq-wip,maximedenes/coq,william-lawvere/coq,silene/coq,SkySkimmer/coq,gares/coq,amintimany/coq,letouzey/coq-wip,JasonGross/coq,Lionel-Rieg/coq,william-lawvere/coq,herbelin/github-coq,amintimany/coq,SkySkimmer/coq,coq/coq,ejgallego/coq,amintimany/coq,jpdeplaix/coq,mattam82/coq,jpdeplaix/coq,Matafou/coq,gares/coq,letouzey/coq-wip,coq/coq,ppedrot/coq,herbelin/github-coq,ppedrot/coq