Fixes for GCC 14.

--- recoll-1.27.9/internfile/mh_xslt.cpp	2020-09-05 08:43:16.000000000 +0100
+++ recoll-1.27.9/internfile/mh_xslt.cpp	2025-04-18 13:21:59.612800042 +0100
@@ -65,7 +65,7 @@
     xmlDocPtr getDoc() {
         int ret;
         if ((ret = xmlParseChunk(ctxt, nullptr, 0, 1))) {
-            xmlError *error = xmlGetLastError();
+            auto error = xmlGetLastError();
             LOGERR("FileScanXML: final xmlParseChunk failed with error " <<
                    ret << " error: " <<
                    (error ? error->message :
@@ -94,7 +94,7 @@
         }            
         int ret;
         if ((ret = xmlParseChunk(ctxt, buf, cnt, 0))) {
-            xmlError *error = xmlGetLastError();
+            auto error = xmlGetLastError();
             LOGERR("FileScanXML: xmlParseChunk failed with error " <<
                    ret << " for [" << buf << "] error " <<
                    (error ? error->message :