Compatibility with coq-interval.4.7.0

The relevant change in coq-interval is
```diff
diff --git a/src/Tactic.v b/src/Tactic.v
index 6aec7b6..de2181d 100644
--- a/src/Tactic.v
+++ b/src/Tactic.v
@@ -53,7 +53,7 @@ Module I1 := FloatIntervalFull F.
 Module IT1 := IntegralTacticAux F I1.
 Module PT1 := PlotTacticAux F I1.
 Module RT1 := RootTacticAux F I1.
-Module I2 := FloatIntervalFull Tactic_float.Float.
+Module I2 := Tactic_float.Interval.
 Module IT2 := IntegralTacticAux Tactic_float.Float I2.
 Module PT2 := PlotTacticAux Tactic_float.Float I2.
 Module RT2 := RootTacticAux Tactic_float.Float I2.
```

I have no idea what I'm doing, but the import seems to be unused?

vcfloat/Prune.v

@@ -5,7 +5,7 @@ Require Import Setoid.
 
 Import Coq.Lists.List ListNotations.
 Import Tree. (* must import this _after_ List *)
-Import Interval Private Interval_helper I2 IT2.IH I2.T Xreal Eval.Reify.
+Import Interval Private Interval_helper I2 IT2.IH Xreal Eval.Reify.
 
 Import Basic.
 Import Bool.