[SECURITY] Fedora 26 Update: potrace-1.15-1.fc26

Potrace is a utility for tracing a bitmap, which means, transforming a bitm ap into a smooth, scalable image. The input is a bitmap (PBM, PGM, PPM, or BMP format), and the default output is an encapsulated PostScript file (EPS). A typical use is to create EPS files from scanned data, such as company or university logos, handwritten notes, etc. The resulting image is not “jaggy” like a bitmap, but smooth. It can then be rendered at any resolution. Potrace can currently produce the following output formats: EPS, PostScript, PDF, SVG (scalable vector graphics), Xfig, Gimppath, and PGM (for easy antialiasing). Additional backends might be added in the future. Mkbitmap is a program distributed with Potrace which can be used to pre-pro cess the input for better tracing behavior on greyscale and color images.