Roll libxslt to 891681e3e948f31732229f53cb6db7215f740fc7

BUG=583156,583171

Review URL: https://codereview.chromium.org/1853083002

Cr-Commit-Position: refs/heads/master@{#385338}
exsltFuncStyleInit (xsltStylesheetPtr style ATTRIBUTE_UNUSED,
		    const xmlChar *URI ATTRIBUTE_UNUSED) {
    return xmlHashCreate(1);
}

exsltFuncStyleInit (xsltStylesheetPtr style ATTRIBUTE_UNUSED,
		    const xmlChar *URI ATTRIBUTE_UNUSED) {
    return xmlHashCreate(1);
}
