ereal inverse + simplification mule and mule_def #4167

Job	Run time
coq	46s
rocq-core	47s
rocq-elpi	52s
coq-elpi	48s
stdlib	47s
mathcomp-bigenough	50s
mathcomp-finmap	49s
hierarchy-builder	54s
mathcomp	50s
mathcomp-classical	3m 2s
mathcomp-analysis-single	16m 8s
mathcomp-reals	2m 15s
mathcomp-experimental-reals	2m 1s
mathcomp-reals-stdlib	1m 32s
	32m 21s

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