python-six: bump to 1.17.0

Changes since 1.16.0:
- Drop Python 2.7 and 3.5 support
- Add ensure_str(), ensure_binary(), ensure_text() helpers
- Various minor fixes and maintenance updates

six 1.17.0 switched to pyproject.toml with setuptools build backend,
so add PKG_BUILD_DEPENDS on python-setuptools/host.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-six/test.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+[ "$1" = python3-six ] || exit 0
+
+python3 - <<'EOF'
+import six
+
+# Check version
+assert six.PY3, "Expected PY3 to be True"
+assert not six.PY2, "Expected PY2 to be False"
+
+# Test string types
+assert six.string_types == (str,)
+assert six.text_type == str
+assert six.binary_type == bytes
+assert six.integer_types == (int,)
+
+# Test moves
+from six.moves import range
+assert list(range(3)) == [0, 1, 2]
+
+# Test b() and u() helpers
+assert six.b('hello') == b'hello'
+assert six.u('hello') == 'hello'
+
+# Test ensure_str / ensure_binary / ensure_text
+assert six.ensure_str('hello') == 'hello'
+assert six.ensure_binary('hello') == b'hello'
+assert six.ensure_text(b'hello') == 'hello'
+
+print("python-six OK")
+EOF