hack based on Arjan van de Ven suggestion to reduce ELF footprint and

* elfgcchack.h doc/elfgcchack.xsl libxml.h: hack based on Arjan van de
  Ven suggestion to reduce ELF footprint and generated code. Based on
  aliasing of libraries function to generate direct call instead of
  indirect ones
* doc/libxml2-api.xml doc/Makefile.am doc/apibuild.py: added automatic
  generation of elfgcchack.h based on the API description, extended
  the API description to show the conditionals configuration flags
  required for symbols.
* nanohttp.c parser.c xmlsave.c include/libxml/*.h: lot of cleanup
* doc/*: regenerated the docs.
Daniel
diff --git a/doc/APIchunk4.html b/doc/APIchunk4.html
index 126e589..bf7ffdc 100644
--- a/doc/APIchunk4.html
+++ b/doc/APIchunk4.html
@@ -290,6 +290,7 @@
 <a href="html/libxml-tree.html#xmlSaveFormatFileEnc">xmlSaveFormatFileEnc</a><br />
 <a href="html/libxml-xmlreader.html#xmlTextReaderSetParserProp">xmlTextReaderSetParserProp</a><br />
 </dd><dt>Note:</dt><dd><a href="html/libxml-parser.html#fatalErrorSAXFunc">fatalErrorSAXFunc</a><br />
+<a href="html/libxml-uri.html#xmlBuildRelativeURI">xmlBuildRelativeURI</a><br />
 <a href="html/libxml-encoding.html#xmlCharEncodingOutputFunc">xmlCharEncodingOutputFunc</a><br />
 <a href="html/libxml-entities.html#xmlGetDtdEntity">xmlGetDtdEntity</a><br />
 <a href="html/libxml-parserInternals.html#xmlParseAttValue">xmlParseAttValue</a><br />