Ignore non-mx-suites when looking for a repo to import

Author: msimacek

mx.graalpython/mx_graalpython.py

@@ -741,11 +741,12 @@ def delete_self_if_testdownstream(args):
 
 def update_import(name, suite_py, rev="origin/master"):
     parent = os.path.join(SUITE.dir, "..")
+    dep_dir = None
     for dirpath, dirnames, _ in os.walk(parent):
         if os.path.sep in os.path.relpath(dirpath, parent):
             dirnames.clear() # we're looking for siblings or sibling-subdirs
-        elif name in dirnames:
-            dep_dir = os.path.join(os.path.join(dirpath))
+        elif name in dirnames and os.path.isdir(os.path.join(dirpath, name, "mx.%s" % name)):
+            dep_dir = dirpath
             break
     if not dep_dir:
         mx.warn("could not find suite %s to update" % name)