[wwwdocs][Patch] gcc-15: Fortran - mention -funsigned + PowerPC Darwin IEEE module support

[Tobias Burnus]

Hi all,

I thought it makes sense to have a look at what went into GCC 15 to
update the Fortran section. However, while several bugs were fixed
(and extended some features a tiny bit) [hooray!], I did not really
see many newsworthy features.

Comments, remarks to, approval of the attached wwwdocs patch?

Tobias

PS: Anuj, the GSoC student, nearly finished his do-concurrent patch,
which will add the local/local_init/shared/default(none) of F2018
and the reduce of F2023. Still no fancy parallelization, but the first
step + useful as it will permit compiling such code and it does works
as serially run code.
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