Remove double definition warning for zlib in case only 64-bit versions of adler32_combine and crc32_combine are used.
Remove double definition warning for zlib in case only 64-bit versions of adler32_combine and crc32_combine are used.

stcorp/coda,stcorp/coda,stcorp/coda,stcorp/coda,stcorp/coda,stcorp/coda,stcorp/coda