[Zlib-devel] Byte-swapping cleanup

[Steve Snyder]

The attached patch (against ZLib v1.2.6) does the following:

In crc32.c replaced REV() macro with ZSWAP32() macro

In inflate.c replaced REVERSE() macro with ZSWAP32() macro

In zutil.h, use MSVC or GnuC byte-swapping intrinsic functions (typically backed by arch-specific CPU byte-swapping instruction)

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