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