[WIP] Drastically reduce Windows build log size

.bazelrc

@@ -92,5 +92,10 @@ build:windows --cxxopt='/DWINDOWS_LEAN_AND_MEAN' --host_cxxopt='/DWINDOWS_LEAN_A
 # The `/std:c++14` argument is unused during boringssl compilation and we don't
 # want a warning when compiling each file.
 build:windows --cxxopt='-Wno-unused-command-line-argument' --host_cxxopt='-Wno-unused-command-line-argument'
+# This warning triggers on anything V8-related, causing the CI error log to be incredibly bloated.
+# V8's bazel does disable it for clang-based toolchains, but unfortunately the Windows setup is not
+# being detected as clang...
+# TODO: Make this a patch for V8 `bazel/defs.bzl`? Submit to V8?
+build:windows --cxxopt='-Wno-invalid-offsetof' --host_cxxopt='-Wno-invalid-offsetof'
 
 build:windows --@capnp-cpp//src/kj:openssl=True --@capnp-cpp//src/kj:zlib=True