Removed header and validated on new windows machine (llvm#96724)

![image](https://github.com/llvm/llvm-project/assets/25160653/2044cc8e-72d5-49ec-9439-256555f5fd2b)

In llvm#95312 uint and `#include <unistd.h>` were introduced. These broke
the windows build. I addressed uint in llvm#96564, but include went unfixed.
So I acquired myself a windows machine to validate.

Author: Jlalond

lldb/source/Plugins/ObjectFile/Minidump/ObjectFileMinidump.cpp

@@ -18,7 +18,6 @@
 #include "lldb/Utility/Log.h"
 
 #include "llvm/Support/FileSystem.h"
-#include <unistd.h>
 
 using namespace lldb;
 using namespace lldb_private;