[host] windows: add delayExecution function for more accurate sleeps

This change not only exposes and allows use of NtDelayExecution, but
also moves the code to set the system timer resolution.

host/platform/Windows/include/windows/delay.h

@@ -0,0 +1,34 @@
+/**
+ * Looking Glass
+ * Copyright (C) 2017-2021 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <Windows.h>
+
+typedef NTSTATUS (__stdcall *ZwSetTimerResolution_t)(ULONG RequestedResolution,
+    BOOLEAN Set, PULONG ActualResolution);
+extern ZwSetTimerResolution_t ZwSetTimerResolution;
+
+typedef NTSTATUS (__stdcall *NtDelayExecution_t)(BOOL Alertable,
+    PLARGE_INTEGER DelayInterval);
+extern NtDelayExecution_t NtDelayExecution;
+
+void delayInit(void);
+
+// like sleep but more accurate
+void delayExecution(float ms);