bitbake: event/runqueue: Drop StampUpdate event, its pointless/unused

Whilst this class has existed for years, it doesn't have any
users and has a questionable interface. Drop it to allow for further
simplification and changes.

(Bitbake rev: 3ab51764f7965d696bb2c5a872bf161473df4289)

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

bitbake/lib/bb/event.py

@@ -404,23 +404,6 @@ class RecipeTaskPreProcess(RecipeEvent):
 class RecipeParsed(RecipeEvent):
     """ Recipe Parsing Complete """
 
-class StampUpdate(Event):
-    """Trigger for any adjustment of the stamp files to happen"""
-
-    def __init__(self, targets, stampfns):
-        self._targets = targets
-        self._stampfns = stampfns
-        Event.__init__(self)
-
-    def getStampPrefix(self):
-        return self._stampfns
-
-    def getTargets(self):
-        return self._targets
-
-    stampPrefix = property(getStampPrefix)
-    targets = property(getTargets)
-
 class BuildBase(Event):
     """Base class for bitbake build events"""