bitbake: bitbake-worker: Set BB_CURRENTTASK earlier

For some debugging, BB_CURRENTTASK is set too late to be useful as
it isn't present in some event handlers for example. There is no
other way to know which task is actually running so set the value
earlier.

(Bitbake rev: 7daaaaa27f55b5a458656857c6d61a51b34a62fe)

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

bitbake/bin/bitbake-worker

@@ -237,6 +237,7 @@ def fork_off_task(cfg, data, databuilder, workerdata, fn, task, taskname, taskha
                 the_data = databuilder.mcdata[mc]
                 the_data.setVar("BB_WORKERCONTEXT", "1")
                 the_data.setVar("BB_TASKDEPDATA", taskdepdata)
+                the_data.setVar('BB_CURRENTTASK', taskname.replace("do_", ""))
                 if cfg.limited_deps:
                     the_data.setVar("BB_LIMITEDDEPS", "1")
                 the_data.setVar("BUILDNAME", workerdata["buildname"])