Fix font issues (rhbz#1523624) :
     Adjust xfig-3.2.5-urwfonts.patch for new font names in urw-base35-fonts
     Except for the symbols font, use the old un-scalable Adobe PCF Symbol font
       for now as StandardSymbolsPS.otf from urw-base35-fonts is currently broken
     Add a patch to deal with some fonts being scalable, while Symbol is not
     Note the dingbats font is also broken in urw-base35-fonts, but there is no
       replacement for it, so that font is still broken, see rhbz#1534206
    ghostscript-core no longer exists, instead require ghostscript (rhbz#1536581)
    Remove obsolete icon-cache and desktop-database scriptlets
    Add a patch from Debian fixing some issues with arrows