Use different capsule names with and without -builtin

Types generated with and without -builtin are not compatible. Mixing
them in a common type list leads to crashes. Avoid this by using
different capsule names: "type_pointer_capsule" without -builtin and
"type_pointer_capsule_builtin" with.

See #1684

Examples/test-suite/python/python_runtime_data_runme.py

@@ -0,0 +1,11 @@
+import python_runtime_data_builtin as builtin
+import python_runtime_data_nobuiltin as nobuiltin
+
+assert builtin.is_python_builtin()
+assert not nobuiltin.is_python_builtin()
+
+for i in range(1, 5):
+    v1 = builtin.vectord([1.] * i)
+    assert len(v1) == i
+    v2 = nobuiltin.vectord([1.] * i)
+    assert len(v2) == i