[lldb] [llvm] [lldb] Fix write only file action to truncate the file (PR #112657)

[Alex Langford via llvm-commits]

================
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <fcntl.h>
----------------
bulbazord wrote:

CI is good enough for me here. I've approved the PR.

https://github.com/llvm/llvm-project/pull/112657