[PATCH 1/5] features: Rename __GLIBC_USE_ISOC2X to __GLIBC_USE_ISOC23

[Joseph Myers]

Why?  You do realise that the DIS ballot resolution isn't until 2024, and 
it's entirely plausible that we end up with an FDIS if there are any 
technical comments on the DIS ballot?  We haven't actually discussed 
whether to *call* it C24, or whether to increase the __STDC_VERSION__ 
value (and other associated values), yet at the current meeting (if that's 
to be discussed, Other Business would be the natural agenda item), but it 
seems extremely premature to suppose the name will be C23, and rename 
internal interfaces accordingly, when we know WG14 don't be done with it 
until January 2024 at the earliest, or several months later if an FDIS is 
needed.

-- 
Joseph S. Myers
joseph@codesourcery.com