修复编译错误

[FH0]

遇到了 #590 里面提到的编译问题。添加--disable-harden后解决。

[Yh793]

我编译的时候没出现过，padavan-ng是禁用了的。dropbear的编译说明 By default Dropbear adds various build flags that improve robustness against programming bugs (good for security). If these cause problems they can be disabled with ./configure --disable-harden