[diff.cpp17.library] Add new headers since C++17.

Author: jensmaurer

source/compatibility.tex

@@ -2153,13 +2153,19 @@
 \rationale New functionality.
 \effect
 The following \Cpp{} headers are new:
+\tcode{<barrier>},
 \tcode{<bit>},
-\tcode{<compare>},
+\tcode{<compare>},\newline
 \tcode{<concepts>},
 \tcode{<coroutine>},
+\tcode{<format>},
+\tcode{<latch>},
 \tcode{<numbers>},
 \tcode{<ranges>},
+\tcode{<semaphore>},
+\tcode{<source_location>},
 \tcode{<span>},
+\tcode{<stop_token>},
 \tcode{<syncstream>}, and
 \tcode{<version>}.
 Valid \CppXVII{} code that \tcode{\#include}{s} headers with these names may be