exec/cpu-all: Remove unused 'qemu/thread.h' header

Nothing is required from "qemu/thread.h" in "exec/cpu-all.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Message-Id: <20231212123401.37493-13-philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 586dc56..4de0d5a 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -22,7 +22,6 @@
 #include "exec/cpu-common.h"
 #include "exec/memory.h"
 #include "exec/tswap.h"
-#include "qemu/thread.h"
 #include "hw/core/cpu.h"
 
 /* some important defines: