Bug#1113934: Build for IEEE long double on ppc64el

[Matthias Klose]

Package: src:llvm-toolchain-21
Version: 1:21.1.0-1
Severity: serious
Tags: sid forky
User: debian-gcc at lists.debian.org
Usertags: ieee-long-double

We are working on https://wiki.debian.org/ToolChain/IEEELongDouble

llvm-toolchain-19 and llvm-toolchain-21 are already prepared for that, 
these just need a successful upload, which now requires either 
bootstrapping with gcc-14, or fixing the C23 issues.