func MulByteSliceLE(c T, in, out []byte) {
	if platformLittleEndian {
		mulByteSliceLEPlatformLE(c, in, out)
	} else {
		mulByteSliceLEGeneric(c, in, out)
	}
}
MulByteSliceLE treats in and out as arrays of Ts stored in
little-endian format, and sets each out<T>[i] to c.Times(in<T>[i]).
package gf2p16