[MLIR][Python] Update Nanobind Warnings List for clang-cl on Windows

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.

Reviewers: makslevental, jpienaar, rkayaith

Reviewed By: makslevental

Pull Request: https://github.com/llvm/llvm-project/pull/166828

mlir/cmake/modules/AddMLIRPython.cmake

@@ -791,7 +791,6 @@ function(add_mlir_python_extension libname extname)
       get_property(NB_LIBRARY_TARGET_NAME TARGET ${libname} PROPERTY LINK_LIBRARIES)
       target_compile_options(${NB_LIBRARY_TARGET_NAME}
         PRIVATE
-          -Wall -Wextra -Wpedantic
           -Wno-c++98-compat-extra-semi
           -Wno-cast-qual
           -Wno-covered-switch-default
@@ -799,11 +798,11 @@ function(add_mlir_python_extension libname extname)
           -Wno-nested-anon-types
           -Wno-unused-parameter
           -Wno-zero-length-array
+          -Wno-missing-field-initializers
           ${eh_rtti_enable})
 
       target_compile_options(${libname}
         PRIVATE
-          -Wall -Wextra -Wpedantic
           -Wno-c++98-compat-extra-semi
           -Wno-cast-qual
           -Wno-covered-switch-default
@@ -811,6 +810,7 @@ function(add_mlir_python_extension libname extname)
           -Wno-nested-anon-types
           -Wno-unused-parameter
           -Wno-zero-length-array
+          -Wno-missing-field-initializers
           ${eh_rtti_enable})
     endif()