[clang] [lldb] [llvm] [Support][Driver][LLDB] Guard WIN32_LEAN_AND_MEAN definitions with #ifndef (PR #213045)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/lib/Driver/ToolChains/MSVC.cpp lldb/include/lldb/Host/windows/windows.h llvm/include/llvm/Support/Windows/WindowsSupport.h llvm/lib/WindowsDriver/MSVCPaths.cpp --diff_from_common_commit
``````````

:warning:
The reproduction instructions above might return results for more than one PR
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changing `origin/main` to the base branch/commit you want to compare against.
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<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/MSVC.cpp b/clang/lib/Driver/ToolChains/MSVC.cpp
index 07cf2ee21..84bc2db6d 100644
--- a/clang/lib/Driver/ToolChains/MSVC.cpp
+++ b/clang/lib/Driver/ToolChains/MSVC.cpp
@@ -26,14 +26,14 @@
 #include <cstdio>
 
 #ifdef _WIN32
-  #ifndef WIN32_LEAN_AND_MEAN
-  #define WIN32_LEAN_AND_MEAN
-  #endif
-  #define NOGDI
-  #ifndef NOMINMAX
-    #define NOMINMAX
-  #endif
-  #include <windows.h>
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#define NOGDI
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#include <windows.h>
 #endif
 
 using namespace clang::driver;

``````````

</details>


https://github.com/llvm/llvm-project/pull/213045