[llvm-branch-commits] [MLIR][Python] Update Nanobind Warnings List for clang-cl on Windows (PR #166828)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/166828

We recently moved over to compiling with clang-cl on Windows. This ended
up causing a large increase in warnings, particularly due to how
warnings are handled in nanobind. cd91d0fff9293a904704784c92c28637bfebef45
initially set -Wall -Wextra and -Wpedantic while fixing another issue,
which is probably not what we want to do on third-party code. We also
need to disable -Wmissing-field-initializers to get things clean in this
configuration.