The declaration of ap_get_mime_headers_from() is falsy in the previous patch, you should read instead :
+AP_DECLARE(apr_status_t)
+ap_get_mime_headers_from(request_rec *r, apr_bucket_brigade *bb,
+ ap_filter_t *from, apr_read_type_e block,
+ apr_table_t *to, ap_mime_headers_ctx_t **ctx)
+{
+ return ap_parse_mime_headers(r, bb, from, block, to, ctx, NULL, NULL);
+}
+
