jni_ vec_ pow
fun jni_vec_pow(env: CPointer<JNIEnvVar>, thisObject: jobject, a: jdoubleArray, aOffset: jint, aSize: jint, b: jdouble)
fun jni_vec_pow(env: CPointer<JNIEnvVar>, thisObject: jobject, a: jdoubleArray, aOffset: jint, aSize: jint, b: jdouble)