um: generic ftrace.h will do...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/include/asm/Kbuild

@@ -1,2 +1,3 @@
 generic-y += bug.h cputime.h device.h emergency-restart.h futex.h hardirq.h
 generic-y += hw_irq.h irq_regs.h kdebug.h percpu.h sections.h topology.h xor.h
+generic-y += ftrace.h

arch/um/include/asm/ftrace.h

@@ -1 +0,0 @@
-/* empty */