git: openjdk/loom: fibers: Fix windows build

[duke]

Changeset: 968aeb9a
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2021-11-06 16:15:27 +0000
URL:       https://git.openjdk.java.net/loom/commit/968aeb9a6e5142071282cbeeb913e8c58a53adeb

Fix windows build

! test/hotspot/jtreg/serviceability/jvmti/vthread/SelfSuspendDisablerTest/libSelfSuspendDisablerTest.cpp