graphics/inkscape-open-symbols: Add new port
These symbol libraries are sets of SVG symbols located in one SVG document and
usable with Inkscape. Symbols included:
- Google Material Design Icons
- Github Octicons
- Font Awesome Icons
- Fork Awesome
- Gnome Icon Theme Symbolic
- Automattic Genericons
- Taiga Icons
- Open Iconic
- Entypo
- Weatherize
- StateFace
- EmojiOne
- Dashicons
- CircuiTikZ
- Ionicons
- SJJB Map Icons