zlib: Update to version 1.3

zlib: Update to version 1.3

- IPFire-3.x
- Update from version 1.2.13 to 1.3
- Changelog
    1.3
	    Building using K&R (pre-ANSI) function definitions is no longer supported.
	    Fixed a bug in deflateBound() for level 0 and memLevel 9.
	    Fixed a bug when gzungetc() is used immediately after gzopen().
	    Fixed a bug when using gzflush() with a very small buffer.
	    Fixed a crash when gzsetparams() is attempted for a transparent write.
	    Fixed test/example.c to work with FORCE_STORED.
	    Fixed minizip to allow it to open an empty zip file.
	    Fixed reading disk number start on zip64 files in minizip.
	    Fixed a logic error in minizip argument processing.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>