base.bbclass: remove unneeded bb.runqueue import

base.bbclass no longer uses bb.runqueue[1]. Remove the import.

[1] https://git.openembedded.org/openembedded-core/commit/?id=2af49716504f65be0cb01f609ea9bfa334926589

(From OE-Core rev: f28415e3ca69b2fb81ae3e3987ef40aa8184b82d)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-global/base.bbclass

@@ -279,8 +279,6 @@ def buildcfg_neededvars(d):
 addhandler base_eventhandler
 base_eventhandler[eventmask] = "bb.event.ConfigParsed bb.event.MultiConfigParsed bb.event.BuildStarted bb.event.RecipePreFinalise bb.event.RecipeParsed bb.event.RecipePreDeferredInherits"
 python base_eventhandler() {
-    import bb.runqueue
-
     if isinstance(e, bb.event.RecipePreDeferredInherits):
         # Use this to snoop on class extensions and set these up before the deferred inherits
         # are processed which allows overrides on conditional variables.