Remove Stdlib dependency #655

Job	Run time
coq	59s
stdlib	59s
coq-elpi-tests	1m 46s
coq-elpi-no-stdlib	1m 33s
coq-elpi	1m 33s
bignums	1m 1s
coq-elpi-tests-stdlib	1m 36s
hierarchy-builder	1m 26s
mathcomp-ssreflect	3m 16s
mathcomp-fingroup	2m 6s
mathcomp-bigenough	1m 29s
mathcomp-finmap	1m 36s
mathcomp-algebra	3m 36s
mathcomp-solvable	2m 46s
multinomials	2m 24s
mathcomp-classical	3m 18s
mathcomp-field	4m 35s
mathcomp-reals	3m 38s
mathcomp-reals-stdlib	1m 38s
mathcomp-experimental-reals	2m 9s
mathcomp-analysis	9m 54s
mathcomp-character	2m 31s
mathcomp-real-closed	2m 34s
mathcomp	1m 56s
coqeal	3m 24s
odd-order	9m 20s
mathcomp-analysis-stdlib	1m 53s
	1h 14m 56s

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