Another one fix for MSVS2017

AlexeyAB

2018-08-14 7f9145729c2a2b64a7aeb3806f7c3d21771fce94

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classes= 20
train  = data/train_voc.txt
valid  = data/2007_test.txt
#difficult = data/difficult_2007_test.txt
names = data/voc.names
backup = backup/