please add exception for llvm-toolchain-22 1:22.1.8-1~deb13u4 to allow security-buildds to use it

[Andres Salomon]

Hi,

Chromium has been carrying patches to make it work with 
llvm-toolchain-19, and I've uploaded llvm-toolchain-22 to 
stable-proposed-updates (and pochu already uploaded llvm-toolchain-22 to 
oldstable-pu and oldoldstable-pu) in order to be able to drop those 
patches as well as use a newer rustc. I didn't realize (mea culpa) that 
I needed to ask for an exception from the wanna-build team in order to 
have security buildds use packages from s-pu. Can we please have an 
exception for llvm-toolchain-22 in s-pu for the security buildds? 
llvm-toolchain-22 only supports static linking, so anything that builds 
against it shouldn't end up with any binary package dependencies on 
libc++1(-19/-22) or anything like that.

Note that I have a pending security update (151.0.7922.173-1~deb13u1) 
that was already uploading and build-deps on llvm-toolchain-22. The 
equivalent bookworm-security (deb12u1) release already built, but the 
trixie-security version is still being given back on the security 
buildds due to lack of llvm-toolchain-22. So there is a bit of urgency 
in getting either an ACK or NACK to this request.

Thanks,
Andres