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refactor _unzOpen_stream #551

Job	Run time
Ubuntu 20 GCC	43s
Ubuntu GCC ASAN	2m 20s
Ubuntu GCC UBSAN	2m 5s
Ubuntu GCC MSAN	55s
Ubuntu 20 Clang	45s
Ubuntu 20 Clang 6.0	1m 1s
Ubuntu GCC	57s
Ubuntu GCC OSB	43s
Ubuntu Clang	1m 4s
Ubuntu Clang No Zlib	1m 1s
Ubuntu Clang No Bzip2	57s
Ubuntu Clang No LZMA	1m 2s
Ubuntu Clang No Zstd	1m 4s
Ubuntu Clang No Pkcrypt	1m 2s
Ubuntu Clang No Winzip AES	43s
Ubuntu Clang No Encryption	1m 7s
Ubuntu Clang Compress Only	55s
Ubuntu Clang Decompress Only	57s
Ubuntu Clang OpenSSL	1m 4s
Windows MSVC	1m 50s
Windows GCC Code Coverage	3m 6s
macOS Xcode	44s
macOS Xcode Code Coverage	1m 13s
macOS Xcode LibCompression	58s
macOS Xcode OpenSSL	56s
	29m 12s

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