Remove unnecessary strictfp modifier

Turbine's minimum supported JDK version is JDK 17.

This fixes the following warning:

```
third_party/java_src/turbine/java/com/google/turbine/binder/ConstEvaluator.java:84: warning: [strictfp] as of release 17, all floating-point expressions are evaluated strictly and 'strictfp' is not required
public strictfp class ConstEvaluator {
                ^
```

PiperOrigin-RevId: 677531227

java/com/google/turbine/binder/ConstEvaluator.java

@@ -79,9 +79,10 @@
 /**
  * Constant expression evaluation.
  *
- * <p>JLS §15.4 requires this class to be strictfp.
+ * <p>This class requires strict floating point operations. In Java SE 17 and later, the Java SE
+ * Platform always requires strict evaluation of floating-point expressions.
  */
-public strictfp class ConstEvaluator {
+public class ConstEvaluator {
 
   /** The symbol of the originating class, for visibility checks. */
   private final @Nullable ClassSymbol origin;