BUG: smithy 3.43.0 creates too many jobs on ctng-compiler-activation

[h-vetinari]

Since smithy 3.43.0, the rerender of https://github.com/conda-forge/ctng-compiler-activation-feedstock is incorrect - it creates one job per clang & GCC version, when there should only be a job per GCC version that builds all clangs. Here's is an example commit where this goes wrong: conda-forge/ctng-compiler-activation-feedstock@5ca997a

Going back to 3.42.1 fixes the problem.

[h-vetinari]

I started bisecting this, and it seems to be a regression between conda-build 24.7 & 24.9. Not sure what changed yet...

In particular, I can get a correct rerender with conda-build 24.7 and a broken one with 24.9 at several points in the recent smithy history (including 3.34.0 and roughly ~3.42.1)

[jaimergp]

xref to a possible fix: conda/conda-build#5535