Remove unused pybind copts

Since this target has no srcs these are unused

pybind11-BUILD.bazel

@@ -16,23 +16,7 @@ cc_library(
             "include/pybind11/common.h",
         ],
     ),
-    copts = select({
-        ":msvc_compiler": [],
-        "//conditions:default": [
-            "-fexceptions",
-            # Useless warnings
-            "-Xclang-only=-Wno-undefined-inline",
-            "-Xclang-only=-Wno-pragma-once-outside-header",
-            "-Xgcc-only=-Wno-error",  # no way to just disable the pragma-once warning in gcc
-        ],
-    }),
     includes = ["include"],
     visibility = ["//visibility:public"],
     deps = ["@rules_python//python/cc:current_py_cc_headers"],
 )
-
-config_setting(
-    name = "msvc_compiler",
-    flag_values = {"@bazel_tools//tools/cpp:compiler": "msvc-cl"},
-    visibility = ["//visibility:public"],
-)