Adapt to rocq-prover/rocq#19530 (#524)

Splitting coq-stdlib out introduces a mysterious problem with `Zeq_bool`.  This PR is a work around.

Author: proux01

lib/IEEE754_extra.v

@@ -992,6 +992,8 @@ Remark bounded_Bexact_inverse:
   emin <= e <= emax - prec <-> bounded prec emax Bexact_inverse_mantissa e = true.
 Proof.
   intros. unfold bounded, canonical_mantissa. rewrite andb_true_iff.
+  rewrite ?Z.eqb_compare.
+  fold (Zeq_bool (fexp (Z.pos (digits2_pos Bexact_inverse_mantissa) + e)) e).
   rewrite <- Zeq_is_eq_bool. rewrite <- Zle_is_le_bool.
   rewrite Bexact_inverse_mantissa_digits2_pos.
   unfold fexp, FLT_exp, emin. lia.