This adds the integral overloads of std::to_chars and std::from_chars,
including the changes made by P0682R0. Support for floating point types
is absent.
* include/Makefile.am: Add new <charconv> header.
* include/Makefile.in: Regenerate.
* include/precompiled/stdc++.h: Include <charconv>.
* include/std/charconv: New file.
(to_chars_result, to_chars, from_chars_result, from_chars): Define.
* testsuite/20_util/from_chars/1.cc: New test.
* testsuite/20_util/from_chars/1_neg.cc: New test.
* testsuite/20_util/from_chars/2.cc: New test.
* testsuite/20_util/from_chars/requirements.cc: New test.
* testsuite/20_util/to_chars/1.cc: New test.
* testsuite/20_util/to_chars/1_neg.cc: New test.
* testsuite/20_util/to_chars/2.cc: New test.
* testsuite/20_util/to_chars/requirements.cc: New test.
From-SVN: r253353