lib/package/utils: Improve multiprocess_launch argument passing

The current code for multiple argument passing is horrible. Tweak the
multiprocess_launch function to only convert to a tuple if it isn't already
one, which means we can then use function arguments in a standard way.

(From OE-Core rev: 7c99f90079e722764ebdc30e8d0e781454b3a51a)

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

meta/lib/oe/utils.py

@@ -316,7 +316,9 @@ def multiprocess_launch_mp(target, items, max_process, extraargs=None):
     items = list(items)
     while (items and not errors) or launched:
         if not errors and items and len(launched) < max_process:
-            args = (items.pop(),)
+            args = items.pop()
+            if not type(args) is tuple:
+                args = (args,)
             if extraargs is not None:
                 args = args + extraargs
             p = ProcessLaunch(target=target, args=args)