Java 25 Math/StrictMath emulation

[niloc132]

Java 25 added three unsignedMultiplyExact methods, two powExact methods, and three unsignedPowExact methods. StrictMath has the same method signatures.

https://docs.oracle.com/en/java/javase/26/docs/api/java.base/java/lang/Math.html#unsignedMultiplyExact(int,int)
https://docs.oracle.com/en/java/javase/26/docs/api/java.base/java/lang/Math.html#powExact(int,int)
https://docs.oracle.com/en/java/javase/26/docs/api/java.base/java/lang/Math.html#unsignedPowExact(int,int)

https://docs.oracle.com/en/java/javase/26/docs/api/java.base/java/lang/StrictMath.html#unsignedMultiplyExact(int,int)
https://docs.oracle.com/en/java/javase/26/docs/api/java.base/java/lang/StrictMath.html#powExact(int,int)
https://docs.oracle.com/en/java/javase/26/docs/api/java.base/java/lang/StrictMath.html#unsignedPowExact(int,int)