sstate: Add optimisation for useradd injected dependencies

useradd.bbclass adds sstate dependencies on base-passwd, shadow-native and
shadow-sysroot. Due to the way these are injected, they interact badly with
the other dependency validation logic and end up pulling in dependencies we
don't actually need. This patch adds code to optimise those cases out.

(From OE-Core rev: 784ca68fcca4ffb34390d55d9343570cfdf0305f)

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

meta/classes/sstate.bbclass

@@ -666,6 +666,9 @@ def setscene_depvalid(task, taskdependees, notneeded, d):
 
         # Consider sysroot depending on sysroot tasks
         if taskdependees[task][1] == 'do_populate_sysroot' and taskdependees[dep][1] == 'do_populate_sysroot':
+            # base-passwd/shadow-sysroot don't need their dependencies
+            if taskdependees[dep][0].endswith(("base-passwd", "shadow-sysroot")):
+                continue
             # Nothing need depend on libc-initial/gcc-cross-initial
             if taskdependees[task][0].endswith("-initial"):
                 continue
@@ -681,6 +684,11 @@ def setscene_depvalid(task, taskdependees, notneeded, d):
             # Target populate_sysroot need their dependencies
             return False
 
+        # This is due to the [depends] in useradd.bbclass complicating matters
+        # The logic *is* reversed here due to the way hard setscene dependencies are injected
+        if taskdependees[task][1] == 'do_package' and taskdependees[dep][0].endswith(('shadow-native', 'shadow-sysroot', 'base-passwd')) and taskdependees[dep][1] == 'do_populate_sysroot':
+            continue
+
         # Safe fallthrough default
         bb.debug(2, " Default setscene dependency fall through due to dependency: %s" % (str(taskdependees[dep])))
         return False