Merge commit '714bd040906637441fc10a33d1f6553cfef4938a' into upstream-merge

Merge commit '714bd040906637441fc10a33d1f6553cfef4938a' into upstream-merge

* commit '714bd040906637441fc10a33d1f6553cfef4938a':
  provide dummy signal init functions for win32
  merge all signal initialization with qemu_signalfd_init, rename
  iothread stops the vcpu thread via IPI
  do not use timedwait on qemu_cpu_cond
  do not use timedwait on qemu_pause_cond
  do not use timedwait on qemu_system_cond
  do not use timedwait on qemu_halt_cond
  always signal pause_cond after stopping a VCPU
  exit round-robin vcpu loop if cpu->stopped is true
  always qemu_cpu_kick after unhalting a cpu
  inline cpu_halted into sole caller
  remove CONFIG_THREAD
  add assertions on the owner of a QemuMutex
  include qemu-thread.h early

Conflicts:
	cpus.c