libcriu: add work_dir support

As we've added work_dir_fd to RPC, lets add support for it to libcriu.
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

lib/criu.c

@@ -51,6 +51,12 @@ void criu_set_images_dir_fd(int fd)
 	opts->images_dir_fd = fd;
 }
 
+void criu_set_work_dir_fd(int fd)
+{
+	opts->has_work_dir_fd	= true;
+	opts->work_dir_fd	= fd;
+}
+
 void criu_set_leave_running(bool leave_running)
 {
 	opts->has_leave_running	= true;

lib/criu.h

@@ -31,6 +31,7 @@ int criu_init_opts(void);
 
 void criu_set_pid(int pid);
 void criu_set_images_dir_fd(int fd); /* must be set for dump/restore */
+void criu_set_work_dir_fd(int fd);
 void criu_set_leave_running(bool leave_running);
 void criu_set_ext_unix_sk(bool ext_unix_sk);
 void criu_set_tcp_established(bool tcp_established);