add GDSOFTCLASS to FileAccess and DirAccess derived classes

drivers/windows/dir_access_windows.h

@@ -37,6 +37,7 @@
 struct DirAccessWindowsPrivate;
 
 class DirAccessWindows : public DirAccess {
+	GDSOFTCLASS(DirAccessWindows, DirAccess);
 	enum {
 		MAX_DRIVES = 26
 	};

drivers/windows/file_access_windows.h

@@ -38,6 +38,7 @@
 #include <stdio.h>
 
 class FileAccessWindows : public FileAccess {
+	GDSOFTCLASS(FileAccessWindows, FileAccess);
 	FILE *f = nullptr;
 	int flags = 0;
 	void check_errors(bool p_write = false) const;

drivers/windows/file_access_windows_pipe.h

@@ -37,7 +37,9 @@
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
+
 class FileAccessWindowsPipe : public FileAccess {
+	GDSOFTCLASS(FileAccessWindowsPipe, FileAccess);
 	HANDLE fd[2] = { nullptr, nullptr };
 
 	mutable Error last_error = OK;