tests/basics/memoryview_itemsize: Make portable to 32- and 64-bit archs.

tests/basics/memoryview_itemsize.py

@@ -12,9 +12,12 @@ except ImportError:
         print("SKIP")
         raise SystemExit
 
-for code in ['b', 'h', 'i', 'l', 'q', 'f', 'd']:
+for code in ['b', 'h', 'i', 'q', 'f', 'd']:
     print(memoryview(array(code)).itemsize)
 
+# 'l' varies depending on word size of the machine
+print(memoryview(array('l')).itemsize in (4, 8))
+
 # shouldn't be able to store to the itemsize attribute
 try:
     memoryview(b'a').itemsize = 1