Fix warnings

This change fixes Cosmopolitan so it has fewer opinions about compiler
warnings. The whole repository had to be cleaned up to be buildable in
-Werror -Wall mode. This lets us benefit from things like strict const
checking. Some actual bugs might have been caught too.

third_party/python/Modules/unicodedata_getcode.c

@@ -270,7 +270,7 @@ _PyUnicode_GetUcName(PyObject *self, Py_UCS4 code, char *buffer, int buflen,
         /* copy word string from lexicon.  the last character in the
            word has bit 7 set.  the last word in a string ends with
            0x80 */
-        w = (_PyUnicode_Lexicon +
+        w = (void *)(_PyUnicode_Lexicon +
              BitFieldExtract(_PyUnicode_LexiconOffset, word,
                              _PyUnicode_LexiconOffsetBits));
         while (*w < 128) {