[PROJ] 9.6.0 sharp embed compiler test on gcc7

[Even Rouault]

A fix for that has been merged in the 9.6 branch (post 9.6.0, for 9.6.1) 
per https://github.com/OSGeo/PROJ/pull/4463

> I also don't understand how C23 is handled if sharp embedding is turned
> on.  It would seem one has to end up passing --std for it, because a
> compiler that can compile C23 does not necessarily default to it.
Cf 
https://github.com/OSGeo/PROJ/blob/41139273222d1a5937ff6abcf16350f6ed7db773/src/lib_proj.cmake#L429 
that selectively enables C23 for targets that need it when 
IS_SHARP_EMBED_AVAILABLE_RES is set.
> Does this work for others on compilers that don't support C23?
If they are not too old yes.

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