Fixed default GPU_NUMFILES on linux
Fixed default GPU_NUMFILES on linux


Former-commit-id: dc2d02e6774651886091cb90ead47b1e50d0507c
chunyang-wen/dynet,xunzhang/dynet,shuheik/dynet,xunzhang/dynet,danielhers/dynet,xunzhang/dynet,danielhers/dynet,chunyang-wen/dynet,clab/dynet,clab/dynet,danielhers/dynet,clab/dynet,shuheik/dynet,clab/cnn,clab/dynet,clab/dynet,clab/cnn,danielhers/dynet,chunyang-wen/dynet,danielhers/dynet,clab/dynet,clab/dynet,xunzhang/dynet,clab/cnn,shuheik/dynet,danielhers/dynet,shuheik/dynet,chunyang-wen/dynet,shuheik/dynet,shuheik/dynet,danielhers/dynet,shuheik/dynet