[libextractor] libextractor 0.5.3 released

[Christian Grothoff]

This release fixes various bugs in the exiv2, OO and OLE2 extractors.
The most important fixes are:

* EXTRACTOR_getKeywords2 is now included
* static relocatable version of glib is no longer required (big rewrite of
   ole2 plugin)
* OO plugin works again (fixed use of zlib in-memory decompression)
* OO plugin now determines OpenOffice mime-type (not just "zip" file)
* some gcc-2.95 compile problems and warnings were fixed
  (you still need to --disable-exiv2 to compile with gcc < 3.0)

I hope this solves all of the major problems that have been reported with 
0.5.2.

Christian