sched/headers: Prepare for new header dependencies before moving code to <linux/sched/jobctl.h>

We are going to split <linux/sched/jobctl.h> out of <linux/sched.h>, which
will have to be picked up from other headers and a couple of .c files.

Create a trivial placeholder <linux/sched/jobctl.h> file that just
maps to <linux/sched.h> to make this patch obviously correct and
bisectable.

Include the new header in the file that is going to need it.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/linux/sched/jobctl.h

+#ifndef _LINUX_SCHED_JOBCTL_H
+#define _LINUX_SCHED_JOBCTL_H
+
+#endif /* _LINUX_SCHED_JOBCTL_H */

include/linux/sched/signal.h

@@ -2,5 +2,6 @@
 #define _LINUX_SCHED_SIGNAL_H
 
 #include <linux/sched.h>
+#include <linux/sched/jobctl.h>
 
 #endif /* _LINUX_SCHED_SIGNAL_H */