[gdal-dev] GNU g++-13 and [[clang::fallthrough]]

[Andrew C Aitchison]

Ubuntu 23-04 (Lunar) has g++ v13.0.1 (in the universe section,
this is not the default g++ compiler).
At least as curently shipped, this warns about the line
 	[[clang::fallthrough]];
(partly becuase with the default settings
 	[[fallthrough]];
is now needed to silence warnings where a fallthrough *is* intended).

Based on https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109653#c3
I have attached a patch for ports/cpl_port.h

-- 
Andrew C. Aitchison                      Kendal, UK
                    andrew at aitchison.me.uk
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