zlib: Update to version 1.3.1

zlib: Update to version 1.3.1

- Update from version 1.3 to 1.3.1
- Update of rootfile
- Changelog
    1.3.1
	- Reject overflows of zip header fields in minizip
	- Fix bug in inflateSync() for data held in bit buffer
	- Add LIT_MEM define to use more memory for a small deflate speedup
	- Fix decision on the emission of Zip64 end records in minizip
	- Add bounds checking to ERR_MSG() macro, used by zError()
	- Neutralize zip file traversal attacks in miniunz
	- Fix a bug in ZLIB_DEBUG compiles in check_match()
	- Various portability and appearance improvements

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