qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32

qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32

These are needed for any of the Win32 alarm timer implementations.
They are not tied to mmtimer exclusively.

Jacob tested this patch with both mmtimer and Win32 timers.

Cc: qemu-stable@nongnu.org
Tested-by: Jacob Kroon <jacob.kroon@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
(cherry picked from commit 0727b867542eea7fedfd2c53568e9782627fd3bd)

Conflicts:

	os-win32.c

* updated to retain cpu affinity settings for 1.4

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>