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/APIchunk3.html b/doc/APIchunk3.html
index bf67fcb..4e8cb30 100644
--- a/doc/APIchunk3.html
+++ b/doc/APIchunk3.html
@@ -126,8 +126,8 @@
 <a href="html/libxml-xmlerror.html#xmlSetStructuredErrorFunc">xmlSetStructuredErrorFunc</a><br />
 <a href="html/libxml-xpathInternals.html#xmlXPathFunctionLookup">xmlXPathFunctionLookup</a><br />
 <a href="html/libxml-xpathInternals.html#xmlXPathFunctionLookupNS">xmlXPathFunctionLookupNS</a><br />
-</dd></dl><h2>Letter G:</h2><dl><dt>GCC</dt><dd><a href="html/libxml-xmlversion.html#ATTRIBUTE_ALLOC_SIZE">ATTRIBUTE_ALLOC_SIZE</a><br />
-<a href="html/libxml-xmlversion.html#ATTRIBUTE_UNUSED">ATTRIBUTE_UNUSED</a><br />
+</dd></dl><h2>Letter G:</h2><dl><dt>GCC</dt><dd><a href="html/libxml-xmlversion.html#ATTRIBUTE_UNUSED">ATTRIBUTE_UNUSED</a><br />
+<a href="html/libxml-xmlversion.html#LIBXML_ATTR_ALLOC_SIZE">LIBXML_ATTR_ALLOC_SIZE</a><br />
 <a href="html/libxml-xmlversion.html#LIBXML_ATTR_FORMAT">LIBXML_ATTR_FORMAT</a><br />
 </dd><dt>GEDecl</dt><dd><a href="html/libxml-parserInternals.html#xmlParseEntityDecl">xmlParseEntityDecl</a><br />
 </dd><dt>GET</dt><dd><a href="html/libxml-nanohttp.html#xmlNanoHTTPFetch">xmlNanoHTTPFetch</a><br />