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Expose zlib constants for backwards compat #540

Job	Run time
Ubuntu 20 GCC	55s
Ubuntu GCC ASAN	2m 18s
Ubuntu GCC UBSAN	2m 1s
Ubuntu GCC MSAN	50s
Ubuntu 20 Clang	43s
Ubuntu 20 Clang 6.0	1m 11s
Ubuntu GCC	49s
Ubuntu GCC OSB	49s
Ubuntu Clang	53s
Ubuntu Clang No Zlib	52s
Ubuntu Clang No Bzip2	49s
Ubuntu Clang No LZMA	58s
Ubuntu Clang No Zstd	52s
Ubuntu Clang No Pkcrypt	55s
Ubuntu Clang No Winzip AES	44s
Ubuntu Clang No Encryption	39s
Ubuntu Clang Compress Only	55s
Ubuntu Clang Decompress Only	48s
Ubuntu Clang OpenSSL	58s
Windows MSVC	3m 15s
Windows GCC Code Coverage	5m 46s
macOS Xcode	43s
macOS Xcode Code Coverage	49s
macOS Xcode LibCompression	51s
macOS Xcode OpenSSL	55s
	31m 18s

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