utils: Add all_multilib_tune_list function

Its useful to be able to query a list of variables to obtain the values in each multilib context. This adds such a function which works even if called in the non-default recipe context.

index 3c2a14f..74c5059 100644
@@ -382,3 +382,36 @@ def all_multilib_tune_values(d, var, unique = True, need_split = True, delim = '

     else:
         ret = values
     return " ".join(ret)
+
+def all_multilib_tune_list(d, var):
+    """
+    Return a list of ${var} from each multilib tune configurations
+    Is safe to be called from a multilib recipe/context as it can
+    figure out the original tune and remove the multilib overrides.
+    """
+    values = []
+
+    localdata = bb.data.createCopy(d)
+    overrides = localdata.getVar("OVERRIDES", False).split(":")
+    newoverrides = []
+    for o in overrides:
+        if not o.startswith("virtclass-multilib-"):
+            newoverrides.append(o)
+    localdata.setVar("OVERRIDES", ":".join(newoverrides))
+    localdata.setVar("MLPREFIX", "")
+    origdefault = localdata.getVar("DEFAULTTUNE_MULTILIB_ORIGINAL", True) +    if origdefault:
+        localdata.setVar("DEFAULTTUNE", origdefault)
+    bb.data.update_data(localdata)
+    value = localdata.getVar(var, True)
+    values.append(value)
+    variants = d.getVar("MULTILIB_VARIANTS", True) or ""
+    for item in variants.split():
+        localdata = bb.data.createCopy(d)
+        overrides = localdata.getVar("OVERRIDES", False) + ":virtclass-multilib-" + item +        localdata.setVar("OVERRIDES", overrides)
+        localdata.setVar("MLPREFIX", item + "-")
+        bb.data.update_data(localdata)
+        value = localdata.getVar(var, True)
+        values.append(value)
+    return values