Release of libxml2-2.7.4

* configure.in: new version
* libxml.spec.in: cleanup
* xmlregexp.c: fix a comment
* doc/apibuild.py: update
* doc/*: regenerate everything
diff --git a/doc/APIchunk13.html b/doc/APIchunk13.html
index 1dae544..d1390eb 100644
--- a/doc/APIchunk13.html
+++ b/doc/APIchunk13.html
@@ -522,6 +522,7 @@
 <a href="html/libxml-parser.html#xmlCleanupParser">xmlCleanupParser</a><br />
 <a href="html/libxml-entities.html#xmlCreateEntitiesTable">xmlCreateEntitiesTable</a><br />
 <a href="html/libxml-tree.html#xmlFreeNode">xmlFreeNode</a><br />
+<a href="html/libxml-threads.html#xmlGetThreadId">xmlGetThreadId</a><br />
 <a href="html/libxml-encoding.html#xmlInitCharEncodingHandlers">xmlInitCharEncodingHandlers</a><br />
 <a href="html/libxml-parser.html#xmlKeepBlanksDefault">xmlKeepBlanksDefault</a><br />
 <a href="html/libxml-tree.html#xmlNodeListGetRawString">xmlNodeListGetRawString</a><br />