Dear Jonathan,

    Done! re-patched, below.

Best,
JeanHeyd

2019-12-03  JeanHeyd "ThePhD" Meneide  <phdofthehouse@gmail.com>

        * include/bits/c++config: Add new _GLIBCXX20_DEPRECATED macro.
        * include/std/type_traits: Deprecate is_pod with message.
        * testuite/20_util/is_pod/deprecated-2a.cc (new): test deprecation