[tlbuild] icu-76.2 in TL source tree, requires C++17

[Norbert Preining]

On Sun, 27 Oct 2024, Karl Berry wrote:
> By the way, the only trick I found online to discern which C++ standards 
> are supported by a given gcc/g++ is this:
>   man gcc | grep -e "-std=c++"

I found that:
	gcc -v --help 2> /dev/null | sed -n '/^ *-std=\([^<][^ ]\+\).*/ {s//\1/p}'
or
	gcc -v --help 2> /dev/null | grep c++ | sed -n '/^ *-std=\([^<][^ ]\+\).*/ {s//\1/p}'

Norbert

--
PREINING Norbert                              https://www.preining.info
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