tests/array*: Allow to skip test if "array" is unavailable.

tests/basics/array_construct2.py

@@ -1,4 +1,9 @@
-from array import array
+try:
+    from array import array
+except ImportError:
+    import sys
+    print("SKIP")
+    sys.exit()
 
 # construct from something with unknown length (requires generators)
 print(array('i', (i for i in range(10))))