x86: Include stdbool.h in fpu.h

Otherwise when get used outside of criu code

 | ../../arch/x86/include/asm/fpu.h:98:2: error: unknown type name ‘bool’
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/x86/include/asm/fpu.h

@@ -2,6 +2,7 @@
 #define __CR_ASM_FPU_H__
 
 #include <sys/types.h>
+#include <stdbool.h>
 
 #include "compiler.h"
 #include "asm/int.h"