@font-face src parsing

[ylafon]

See https://lists.w3.org/Archives/Public/www-validator-css/2017Dec/0003.html

Line: 106
Parse Error @font-face { font-family: 'fontello'; font-weight: normal;
font-style: normal; src: url("../fonts/fontello.eot?21718288"); src:
url("../fonts/fontello.eot?21718288#iefix") format("embedded-opentype"),
url("../fonts/fontello.woff2?21718288") format("woff2"),
url("../fonts/fontello.woff?21718288") format("woff"),
url("../fonts/fontello.ttf?21718288") format("truetype"),
url("../fonts/fontello.svg?21718288#fontello") format("svg") }

Line: 500
Parse Error }

[ylafon]

Issue seems related to (old) parsing of 'src'. The whole @font-face parsing needs to be redone.