bitbake: runqueue: Fix corruption issue

We need to copy this set, not modify the original else all kinds
of weird and bad things break, mostly from circular references.
We'll not go into how much sleep I lost tracking down the fallout
from this.

(Bitbake rev: 49927546d2b306830c98f6f9da4a6ad828f6a3a6)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/runqueue.py

@@ -2124,7 +2124,7 @@ class RunQueueExecute:
     # as most code can't handle them
     def build_taskdepdata(self, task):
         taskdepdata = {}
-        next = self.rqdata.runtaskentries[task].depends
+        next = self.rqdata.runtaskentries[task].depends.copy()
         next.add(task)
         next = self.filtermcdeps(task, next)
         while next: