llvm-ar: Fix MinGW compilation

llvm-ar is using CompareStringOrdinal which is available
only starting with Windows Vista (WINVER 0x600).

Fix this by hoising WindowsSupport.h, which sets _WIN32_WINNT
to 0x0601, up to llvm/include/llvm/Support and use it in llvm-ar.

Patch by Cristian Adam!

Differential revision: https://reviews.llvm.org/D74599

(cherry picked from commit 01f9abbb50b11dd26b9ccb7cb565cc955d2b9c74)

This is for https://bugs.llvm.org/show_bug.cgi?id=44907

1 files changed, 1 insertions, 2 deletions

diff --git a/llvm/tools/llvm-ar/llvm-ar.cpp b/llvm/tools/llvm-ar/llvm-ar.cpp
index c339dfe1f33..516cc2626b5 100644
--- a/llvm/tools/llvm-ar/llvm-ar.cpp
+++ b/llvm/tools/llvm-ar/llvm-ar.cpp
@@ -45,8 +45,7 @@
 #endif
 
 #ifdef _WIN32
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
+#include "llvm/Support/Windows/WindowsSupport.h"
 #endif
 
 using namespace llvm;