Fix testapi when building --without-sax1

Broken in commit c61e1273.

testapi.c

@@ -464,6 +464,7 @@
         xmlFreeParserCtxt(val);
 }
-#ifdef LIBXML_SAX1_ENABLED
+#if defined(LIBXML_PUSH_ENABLED) || defined(LIBXML_SAX1_ENABLED) || \
+    defined(LIBXML_SCHEMAS_ENABLED) || defined(LIBXML_VALID_ENABLED)
 #define gen_nb_xmlSAXHandlerPtr 2
 static xmlSAXHandlerPtr gen_xmlSAXHandlerPtr(int no, int nr ATTRIBUTE_UNUSED) {
@@ -468,3 +469,5 @@
 #define gen_nb_xmlSAXHandlerPtr 2
 static xmlSAXHandlerPtr gen_xmlSAXHandlerPtr(int no, int nr ATTRIBUTE_UNUSED) {
+    (void) no;
+#ifdef LIBXML_SAX1_ENABLED
     if (no == 0) return((xmlSAXHandlerPtr) &xmlDefaultSAXHandler);
@@ -470,4 +473,5 @@
     if (no == 0) return((xmlSAXHandlerPtr) &xmlDefaultSAXHandler);
+#endif
     return(NULL);
 }
 static void des_xmlSAXHandlerPtr(int no ATTRIBUTE_UNUSED, xmlSAXHandlerPtr val ATTRIBUTE_UNUSED, int nr ATTRIBUTE_UNUSED) {