azure-pipelines: add commented out loongson build
azure-pipelines: add commented out loongson build

It is currently failing due to an inability to install
libgcc-s1:mips64el (a dependency of libc6:mips64el).  This may just be
a temporary failure since the same commands are working on a sid VM,
but I'm not certain.

nemequ/simde,nemequ/simde,nemequ/simde