tests/basic/[a-f]*: Make skippable.

For small ports which don't have all features enabled.

tests/basics/attrtuple1.py

@@ -4,6 +4,15 @@
 import sys
 t = sys.implementation
 
+# It can be just a normal tuple on small ports
+try:
+    t.name
+except AttributeError:
+    import sys
+    print("SKIP")
+    sys.exit()
+
+
 # test printing of attrtuple
 print(str(t).find("version=") > 0)