Small platform-specific bugfix for draw.py
Small platform-specific bugfix for draw.py

Close #2376

On Gentoo and CentOS (and others?), you get this error:
    Warning: /tmp/tmpjqPQBC:6: string ran past end of line

gnina/gnina,tackgeun/caffe,tackgeun/caffe,gnina/gnina,tackgeun/caffe,wangg12/caffe,wangg12/caffe,CZCV/s-dilation-caffe,gnina/gnina,gnina/gnina,longjon/caffe,wangg12/caffe,wangg12/caffe,gnina/gnina,tackgeun/caffe,CZCV/s-dilation-caffe,gnina/gnina,longjon/caffe,longjon/caffe,CZCV/s-dilation-caffe,longjon/caffe,CZCV/s-dilation-caffe