html: Don't abort on encoding errors

Always enable recovery mode when parsing HTML, so we don't raise fatal
errors.

Regressed with 462bf0b7. Fixes #947.

HTMLparser.c

@@ -5524,6 +5524,11 @@ htmlCtxtSetOptionsInternal(xmlParserCtxtPtr ctxt, int options, int keepMask)
      */
     ctxt->keepBlanks = (options & HTML_PARSE_NOBLANKS) ? 0 : 1;
 
+    /*
+     * Recover from character encoding errors
+     */
+    ctxt->recovery = 1;
+
     /*
      * Changing SAX callbacks is a bad idea. This should be fixed.
      */