As discussed on stackoverflow and the mailing list. GeoServer as of 2.13.1 no longer renders icons which are loaded over http.
Test SLD.
<?xml version="1.0" encoding="UTF-8"?>
<StyledLayerDescriptor xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.1.0" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd" xmlns:se="http://www.opengis.net/se">
<NamedLayer>
<se:Name>cctv_cameras</se:Name>
<UserStyle>
<se:Name>cctv_cameras</se:Name>
<se:FeatureTypeStyle>
<se:Rule>
<se:Name>Single symbol</se:Name>
<se:PointSymbolizer>
<se:Graphic>
<se:ExternalGraphic>
<se:OnlineResource xlink:type="simple" xlink:href="http://maps.runnymede.gov.uk/website/maps/png/community/cctv_cameras.png"/>
<se:Format>image/png</se:Format>
</se:ExternalGraphic>
</se:Graphic>
</se:PointSymbolizer>
</se:Rule>
</se:FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
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