Added lemma to swap mathcomp natural log with Rocqs natural log #4912

Job	Run time
rocq-elpi	3m 19s
rocq-core	2m 28s
coq-elpi	1m 6s
coq	1m 33s
stdlib	4m 4s
hierarchy-builder	1m 48s
mathcomp-bigenough	5m 13s
mathcomp-finmap	3m 18s
mathcomp	14m 55s
mathcomp-classical	10m 5s
mathcomp-analysis-single	26m 56s
mathcomp-reals	4m 38s
mathcomp-experimental-reals	2m 23s
mathcomp-analysis	15m 44s
mathcomp-reals-stdlib	3m 6s
mathcomp-analysis-stdlib	2m 7s
	1h 42m 43s

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