Roll libxslt to 891681e3e948f31732229f53cb6db7215f740fc7

BUG=583156,583171

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

Cr-Commit-Position: refs/heads/master@{#385338}
xsltRegisterExtModule(const xmlChar * URI,
                      xsltExtInitFunction initFunc,
                      xsltExtShutdownFunction shutdownFunc)
{
    return xsltRegisterExtModuleFull(URI, initFunc, shutdownFunc,
                                     NULL, NULL);
}

xsltRegisterExtModule(const xmlChar * URI,
                      xsltExtInitFunction initFunc,
                      xsltExtShutdownFunction shutdownFunc)
{
    return xsltRegisterExtModuleFull(URI, initFunc, shutdownFunc,
                                     NULL, NULL);
}
