tests/misc/: Make few tests skippable.

tests/misc/non_compliant.py

 # tests for things that are not implemented, or have non-compliant behaviour
 
-import array
-import ustruct
+try:
+    import array
+    import ustruct
+except ImportError:
+    import sys
+    print("SKIP")
+    sys.exit()
 
 # when super can't find self
 try:

tests/misc/print_exception.py

+import sys
 try:
-    import uio as io
+    try:
+        import uio as io
+    except ImportError:
+        import io
 except ImportError:
-    import io
-import sys
+    print("SKIP")
+    sys.exit()
+
 if hasattr(sys, 'print_exception'):
     print_exception = sys.print_exception
 else:

tests/misc/recursive_data.py

 # This tests that printing recursive data structure doesn't lead to segfault.
-import uio as io
+try:
+    import uio as io
+except ImportError:
+    import sys
+    print("SKIP")
+    sys.exit()
 
 l = [1, 2, 3, None]
 l[-1] = l

tests/misc/recursive_iternext.py

 # This tests that recursion with iternext doesn't lead to segfault.
+try:
+    enumerate
+    filter
+    map
+    max
+    zip
+except:
+    import sys
+    print("SKIP")
+    sys.exit()
 
 # We need to pick an N that is large enough to hit the recursion
 # limit, but not too large that we run out of heap memory.