[LLDB][Windows]: Don't pass duplicate HANDLEs to CreateProcess

Fixes msys2/MINGW-packages#26030

Author: lb90

lldb/source/Host/windows/ProcessLauncherWindows.cpp

@@ -15,6 +15,7 @@
 #include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/Program.h"
 
+#include <algorithm>
 #include <string>
 #include <vector>
 
@@ -122,6 +123,11 @@ ProcessLauncherWindows::LaunchProcess(const ProcessLaunchInfo &launch_info,
         act->GetFD() == act->GetActionArgument())
       inherited_handles.push_back(reinterpret_cast<HANDLE>(act->GetFD()));
   }
+  // Remove duplicate HANDLEs
+  std::sort(inherited_handles.begin(), inherited_handles.end());
+  inherited_handles.erase(
+      std::unique(inherited_handles.begin(), inherited_handles.end()),
+      inherited_handles.end());
   if (!inherited_handles.empty()) {
     if (!UpdateProcThreadAttribute(
             startupinfoex.lpAttributeList, /*dwFlags=*/0,