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fix: don't replace slashes on UNIX #570

Job	Run time
Ubuntu 20 GCC	50s
Ubuntu GCC ASAN	2m 25s
Ubuntu GCC UBSAN	2m 10s
Ubuntu GCC MSAN	53s
Ubuntu 20 Clang	42s
Ubuntu 20 Clang 6.0	1m 22s
Ubuntu GCC	59s
Ubuntu GCC OSB	46s
Ubuntu Clang	1m 4s
Ubuntu Clang No Zlib	1m 4s
Ubuntu Clang No Bzip2	1m 7s
Ubuntu Clang No LZMA	1m 1s
Ubuntu Clang No Zstd	1m 0s
Ubuntu Clang No Pkcrypt	1m 12s
Ubuntu Clang No Winzip AES	57s
Ubuntu Clang No Encryption	45s
Ubuntu Clang Compress Only	55s
Ubuntu Clang Decompress Only	54s
Ubuntu Clang OpenSSL	58s
Windows MSVC	4m 15s
Windows GCC Code Coverage	6m 4s
macOS Xcode	42s
macOS Xcode Code Coverage	58s
macOS Xcode LibCompression	54s
macOS Xcode OpenSSL	58s
	34m 55s

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