Removed "Pocket PC" from terminal color support function.

Introduced over 13 years ago in 9bea530c33e, Pocket PC was surpassed by
Windows Mobile, then Windows Phone, which has since been retired. The
value "Pocket PC" isn't documented as a value for ``sys.platform`` and
it isn't clear whether it ever worked. There are no tests for this.

django/core/management/color.py

@@ -14,8 +14,7 @@ def supports_color():
     Return True if the running system's terminal supports color,
     and False otherwise.
     """
-    plat = sys.platform
-    supported_platform = plat != 'Pocket PC' and (plat != 'win32' or 'ANSICON' in os.environ)
+    supported_platform = sys.platform != 'win32' or 'ANSICON' in os.environ
 
     # isatty is not always implemented, #6223.
     is_a_tty = hasattr(sys.stdout, 'isatty') and sys.stdout.isatty()