signals: Prepare to split out <linux/signal_types.h> from <linux/signal.h>

Introduce dummy header and add dependencies to places that will depend on it.

Acked-by: Linus Torvalds <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>
diff --git a/include/linux/signal.h b/include/linux/signal.h
index 5308304..d1c2b05 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -1,9 +1,8 @@
 #ifndef _LINUX_SIGNAL_H
 #define _LINUX_SIGNAL_H
 
-#include <linux/list.h>
 #include <linux/bug.h>
-#include <uapi/linux/signal.h>
+#include <linux/signal_types.h>
 
 struct task_struct;