Fix how to display an image with a full url

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@233092 13f79535-47bb-0310-9956-ffa450edef68

pdf/src/plugin-resources/fo-body.xslt

@@ -230,6 +230,9 @@
         </xsl:when>
         <xsl:otherwise>
           <xsl:choose>
+            <xsl:when test="starts-with($ref, 'http://')">
+              <xsl:value-of select="$ref"/>
+            </xsl:when>
             <xsl:when test="string-length($dirName) = 0">
               <xsl:value-of select="$ref"/>
             </xsl:when>