Remove gcc 12 from ubuntu image #851
Merged
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It was added in #843 so that we could use it in runtime's gcc builds, but #850 lets us continue using the existing official debian-based image, so this is no longer necessary.
In fact, the presence of the gcc 12 toolchain directory was causing unrelated problems in dotnet/runtime#84795, because we didn't have
libstdc++-12-devinstalled, but clang was selecting the gcc 12 toolchain. Removing it will let that build use the libstdc++ 11 that is already installed as a dependency of clang-14.@am11 @jkoritzinsky PTAL (@am11 I can't add you directly as a reviewer or I would)