MengXiao92 issues

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                                            MengXiao92

build error in nv_small_256

你好，直接build nv_small是成功的，但是在build nv_small_256是遇到了一个错误，我修改tree.make PROJECTS := nv_small_256 执行命令：./tools/bin/tmake -build ready_for_test 出现错误： make: *** [vcs_build] Error 255 Died at ./tools/bin/tmake line 254. [TMAKE]: DONE 在outdir下，查看log $ cat nv_small_256.verif_trace_player.log Parsing library file '/home/mengxiao/NVDLA/hw-nv_small1/outdir/nv_small_256/vmod/vlibs/NV_DW02_tree.v'...

I met a question with opencv, how can i solve it?

![2019-10-14 11-13-28屏幕截图](https://user-images.githubusercontent.com/41817353/66727830-296ae880-ee74-11e9-819f-302df71b5995.png)

hw01 by mengx

在stbiw文件夹下新建cpp，定义宏STB_IMAGE_WRITE_IMPLEMENTATION，从而保证实现的stbiw库中包含stbi_write_png() 的实现，在库文件中的CMakeLists.txt中add_librarary，同时将当前路径作为stbiw的头文件的搜索路径，这样引用这个它的CMake就可以自动添加这个路径。