[llvm] [CI] Remove Disabled Warning Set on Windows (PR #166838)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/166838

The low hanging fruit that was causing the vast majority of these warnings has been fixed, so reenable them now. There are still a couple more warnings that could probably do with some cleanup, but those can be fixed in the future.

>From a8b7419c183661cfb35d0aecd8ed94b95575d102 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Thu, 6 Nov 2025 20:12:38 +0000
Subject: [PATCH] [CI] Remove Disabled Warning Set on Windows

The low hanging fruit that was causing the vast majority of these
warnings has been fixed, so reenable them now. There are still a couple
more warnings that could probably do with some cleanup, but those can be
fixed in the future.
---
 .ci/monolithic-windows.sh | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.ci/monolithic-windows.sh b/.ci/monolithic-windows.sh
index d1b834cc4e840..beaed71f49f65 100755
--- a/.ci/monolithic-windows.sh
+++ b/.ci/monolithic-windows.sh
@@ -47,7 +47,6 @@ cmake -S "${MONOREPO_ROOT}"/llvm -B "${BUILD_DIR}" \
       -D CMAKE_EXE_LINKER_FLAGS="/MANIFEST:NO" \
       -D CMAKE_MODULE_LINKER_FLAGS="/MANIFEST:NO" \
       -D CMAKE_SHARED_LINKER_FLAGS="/MANIFEST:NO" \
-      -D CMAKE_CXX_FLAGS="-Wno-c++98-compat -Wno-c++14-compat -Wno-unsafe-buffer-usage -Wno-old-style-cast" \
       -D LLVM_ENABLE_RUNTIMES="${runtimes}"
 
 start-group "ninja"