_frozen_importlib: fix lib_python path discovery

Author: cosminbasca

graalpython/lib-graalpython/_frozen_importlib.py

@@ -42,10 +42,10 @@
 lib_python = None
 for p in sys.path:
     if "lib-python/3" in p:
-        lib_python = p
+        path, delim, _ = p.partition('lib-python/3')
+        lib_python = path + delim
         break
 
-
 if lib_python is None:
     raise RuntimeError("Cannot load frozen_importlib")
 

graalpython/lib-graalpython/_frozen_importlib_external.py

@@ -42,7 +42,8 @@
 lib_python = None
 for p in sys.path:
     if "lib-python/3" in p:
-        lib_python = p
+        path, delim, _ = p.partition('lib-python/3')
+        lib_python = path + delim
         break