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refactor _unzOpen_stream #546

Job	Run time
Ubuntu 20 GCC	46s
Ubuntu GCC ASAN	2m 17s
Ubuntu GCC UBSAN	2m 13s
Ubuntu GCC MSAN	1m 6s
Ubuntu 20 Clang	46s
Ubuntu 20 Clang 6.0	56s
Ubuntu GCC	55s
Ubuntu GCC OSB	48s
Ubuntu Clang	52s
Ubuntu Clang No Zlib	55s
Ubuntu Clang No Bzip2	1m 13s
Ubuntu Clang No LZMA	1m 3s
Ubuntu Clang No Zstd	1m 0s
Ubuntu Clang No Pkcrypt	1m 1s
Ubuntu Clang No Winzip AES	1m 0s
Ubuntu Clang No Encryption	45s
Ubuntu Clang Compress Only	1m 10s
Ubuntu Clang Decompress Only	1m 12s
Ubuntu Clang OpenSSL	1m 10s
Windows MSVC	3m 26s
Windows GCC Code Coverage	5m 55s
macOS Xcode	56s
macOS Xcode Code Coverage	54s
macOS Xcode LibCompression	51s
macOS Xcode OpenSSL	55s
	34m 5s

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