fix mode signature #271

Job	Run time
coq	1m 2s
coq-elpi	2m 6s
hierarchy-builder	2m 2s
mathcomp-ssreflect	3m 43s
coquelicot	4m 8s
autosubst	3m 49s
QuickChick	4m 19s
mathcomp-bigenough	4m 12s
mathcomp-fingroup	4m 17s
mathcomp-finmap	3m 59s
relation-algebra	4m 36s
interval	1m 53s
mathcomp-algebra	2m 22s
mathcomp-classical	0s
mathcomp-solvable	0s
multinomials	0s
mathcomp-reals	0s
mathcomp-field	0s
mathcomp-character	0s
mathcomp-real-closed	0s
mathcomp-analysis	0s
mathcomp-experimental-reals	0s
mathcomp-reals-stdlib	0s
mathcomp	0s
coqeal	0s
mathcomp-analysis-stdlib	0s
odd-order	0s
	42m 28s

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