Bug#1124046: emscripten: Please upgrade build-dep to llvm/clang 21

[Emilio Pozuelo Monfort]

On Fri, 26 Dec 2025 00:51:36 +0100 Sylvestre Ledru <sylves...@debian.org> wrote:
Source: emscripten
Severity: important
Dear Maintainer,

We would like to remove llvm-toolchain-19 from the archive.
Please update to 21.

I found this upstream PR [1] that bumped the internal llvm-libc to 21.1.8, while 
we currently have llvm-toolchain-21 21.1.8-2. So perhaps it is possible to 
update emscripten at this time.

Cheers,
Emilio

[1] https://github.com/emscripten-core/emscripten/pull/26151