disable warnings on funcs which use go:linkname

[mvdan]

//go:linkname reflect_typedmemclrpartial reflect.typedmemclrpartial
func reflect_typedmemclrpartial(typ *_type, ptr unsafe.Pointer, off, size uintptr) {
    if writeBarrier.needed && typ.ptrdata != 0 {
        bulkBarrierPreWrite(uintptr(ptr), 0, size)
    }
    memclrNoHeapPointers(ptr, size)
}

off here is an unused parameter, but it cannot be removed, as otherwise the go:linkname would break. I guess the user could rename the parameter to _, but that would be somewhat awkward.