ericniebler
Suppress clang deprecation warning in make_compressed_tuple.
Previously, modern clang versions threw warnings due to the use of the deprecated compressed_tuple within make_compressed_tuple. This caused problems when ranges-v3 or a dependant project included the ranges/v3/utility/compressed_pair.hpp header, either directly or indirectly, via ranges/v3/all.hpp. This commit suppresses the deprecated-declarations warning within the make_compressed_tuple implementation, and adds a deprecation annotation to the former struct, achieving the intended goal of deprecating these structs without disrupting projects that do not use compressed_tuple or make_compressed_tuple.
The deprecation warning fixed by this commit seems to be unique to newer clang versions, not present in clang 10, but introduced before (or in) clang-19. It does not occur when using gcc (tested 7 and 13).
I've rebased this on top of c1ed9bf9 since that commit predated this work and because it compiles cleanly with both gcc and clang (tested using gcc 13 and clang 19).