fix: unzipping with backslashes in the name on UNIX #566

Job	Run time
Ubuntu 20 GCC	44s
Ubuntu GCC ASAN	3m 11s
Ubuntu GCC UBSAN	2m 1s
Ubuntu GCC MSAN	51s
Ubuntu 20 Clang	39s
Ubuntu 20 Clang 6.0	1m 32s
Ubuntu GCC	50s
Ubuntu GCC OSB	46s
Ubuntu Clang	59s
Ubuntu Clang No Zlib	53s
Ubuntu Clang No Bzip2	56s
Ubuntu Clang No LZMA	49s
Ubuntu Clang No Zstd	54s
Ubuntu Clang No Pkcrypt	1m 19s
Ubuntu Clang No Winzip AES	38s
Ubuntu Clang No Encryption	1m 7s
Ubuntu Clang Compress Only	1m 8s
Ubuntu Clang Decompress Only	1m 12s
Ubuntu Clang OpenSSL	1m 11s
Windows MSVC	3m 22s
Windows GCC Code Coverage	5m 56s
macOS Xcode	13s
macOS Xcode Code Coverage	14s
macOS Xcode LibCompression	14s
macOS Xcode OpenSSL	16s
	31m 55s

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