P0646R1 for Debug mode

[François Dumont]

This patch implements P0646R1 for Debug mode containers.

It fixes tests:

23_containers/forward_list/operations/remove_cxx20_return.cc
23_containers/forward_list/operations/unique_cxx20_return.cc
23_containers/list/operations/remove_cxx20_return.cc
23_containers/list/operations/unique_cxx20_return.cc

Note that it also adopt the Lib Defects 526 which had been implemented 
only for the normal mode.

I'll commit this tomorrow if not told otherwise.

 Â Â Â  P0646R1 Improving the Return Value of Erase-Like Algorithms I
 Â Â Â  * include/debug/forward_list (forward_list::__remove_return_type):
 Â Â Â  Define typedef as size_type or void, according to __cplusplus value.
 Â Â Â  (_GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG): Define macro as abi-tag or
 Â Â Â  empty, according to __cplusplus value.
 Â Â Â  (_GLIBCXX20_ONLY): Define macro.
 Â Â Â  (forward_list::remove, forward_list::unique): Use typedef and macro
 Â Â Â  to change return type and add abi-tag for C++2a. Return number of
 Â Â Â  removed elements for C++2a.
 Â Â Â  (forward_list::remove_if<Pred>, forward_list::unique<BinPred>): Use
 Â Â Â  typedef to change return type for C++2a. Return number of removed
 Â Â Â  elements for C++2a.
 Â Â Â  * include/debug/list (list::__remove_return_type): Define typedef as
 Â Â Â  size_type or void, according to __cplusplus value.
 Â Â Â  (_GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG): Define macro as abi-tag or
 Â Â Â  empty, according to __cplusplus value.
 Â Â Â  (_GLIBCXX20_ONLY): Define macro.
 Â Â Â  (list::remove, list::unique): Use typedef and macro to change return
 Â Â Â  type and add abi-tag for C++2a. Return number of removed elements for
 Â Â Â  C++2a.
 Â Â Â  (list::remove_if<Predicate>, list::unique<BinaryPredicate>): Use 
typedef
 Â Â Â  to change return type for C++2a. Return number of removed elements for
 Â Â Â  C++2a.

François

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