SfM-Toy-Library
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fix missing fstream include
Otherwise there will be compilation error
/home/jasjuang/SfM-Toy-Library/SfMToyLib/SfM.cpp:636:18: error: variable ‘std::ofstream ofs’ has initializer but incomplete type
ofstream ofs(prefix + "_points.ply");
^
/home/jasjuang/SfM-Toy-Library/SfMToyLib/SfM.cpp:668:19: error: variable ‘std::ofstream ofsc’ has initializer but incomplete type
ofstream ofsc(prefix + "_cameras.ply");