[Kernel] Add support for XFileEndOfFileInformation.

src/xenia/base/filesystem_win.cc

@@ -115,6 +115,17 @@ class Win32FileHandle : public FileHandle {
       return false;
     }
   }
+  bool SetLength(size_t length) {
+    LARGE_INTEGER position;
+    position.QuadPart = length;
+    if (!SetFilePointerEx(handle_, position, nullptr, SEEK_SET)) {
+      return false;
+    }
+    if (!SetEndOfFile(handle_)) {
+      return false;
+    }
+    return true;
+  }
   void Flush() override { FlushFileBuffers(handle_); }
 
  private: