Remove Stdlib dependency #48

Job	Run time
coq	1m 5s
coq-elpi	1m 40s
hierarchy-builder	1m 40s
mathcomp-ssreflect	3m 15s
mathcomp-bigenough	3m 15s
QuickChick	3m 43s
autosubst	3m 11s
mathcomp-fingroup	3m 47s
mathcomp-finmap	3m 33s
mathcomp-algebra	3m 41s
mathcomp-classical	2m 55s
mathcomp-solvable	2m 47s
multinomials	2m 14s
mathcomp-reals	3m 40s
mathcomp-field	3m 28s
mathcomp-character	2m 43s
mathcomp-real-closed	2m 43s
mathcomp-reals-stdlib	1m 40s
mathcomp-experimental-reals	2m 3s
mathcomp-analysis	9m 33s
mathcomp	2m 45s
coqeal	3m 53s
odd-order	9m 12s
mathcomp-analysis-stdlib	1m 58s
	1h 20m 24s

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