ZLib support replacement

For the past few days, I have been working on a new ZLib header.  Previously, we had used ZLibEx.  While this is an excellent package, we decided that we could not use it.  For the past few days, I have been working on a replacement header and so far, I have verified that this does work properly.  The header is derived from a header I found in the ZLib standard distribution contrib/delphi folder along with some enhancements from the Enhanced zlib package (Code Central ID: 23490).  The header I made has the following advantages:

• It exposes most functions from the zlib.h header file.
• The header should be able to work on Kylix with newer Linux distributions.
• The header uses the new InflateBackInit_, InflateBack, and InflateBackEnd functions for decompressing streams. which is more efficient than using the standard InflateInit_, InflateInit2_, Inflate, and InflateEnd functions.
• The decompress stream routine can work with GZIP, standard ZLib Deflate, and raw deflate streams and can autodetect the appropriate type.
• It is compatible with Borland's ZLib.pas file.
• You can easily replace ZLib objs after building them from the standard ZLib distribution using a make file that is provided in the package's contrib\delphi folder.  This means that the .obj files can be quickly replaced if there is another Cert advisory effecting ZLib.

I know that this is quite a change. The class, TIdCompressorZLibEx, will not be renamed for compatiability though it no longer uses ZLibEx.

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