[PATCH -tip] kvm_tools: fix build fail

[Lai Jiangshan]

Commit e5fd47bfab2df0c2184cc0bf4245d8e1bb7724fb in -tip tree adds a
"bool set_pm_idle_to_default(void);" to system.h which causes kvm_tool build fail:

In file included from include/kvm/barrier.h:13:0,
                 from virtio/core.c:5:
../../arch/x86/include/asm/system.h:404:6: error: expected â=â, â,â, â;â, âasmâ or â__attribute__â before âset_pm_idle_to_defaultâ

Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
---
diff --git a/tools/kvm/include/kvm/barrier.h b/tools/kvm/include/kvm/barrier.h
index c11a239..480276f 100644
--- a/tools/kvm/include/kvm/barrier.h
+++ b/tools/kvm/include/kvm/barrier.h
@@ -7,6 +7,7 @@
  * Provide the dependencies here - we can drop these wrappers once
  * the header is fixed upstream:
  */
+#include <stdbool.h>
 #include <linux/stringify.h>
 #include <linux/bitops.h>
 #include <asm/alternative.h>

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