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Remove left over signing code from v3. #402

Job	Run time
Ubuntu 20 GCC	43s
Ubuntu GCC ASAN	2m 13s
Ubuntu GCC UBSAN	2m 11s
Ubuntu GCC MSAN	49s
Ubuntu 20 Clang	40s
Ubuntu 20 Clang 6.0	58s
Ubuntu GCC	59s
Ubuntu GCC OSB	58s
Ubuntu Clang	55s
Ubuntu Clang No Zlib	1m 4s
Ubuntu Clang No Bzip2	59s
Ubuntu Clang No LZMA	58s
Ubuntu Clang No Zstd	1m 1s
Ubuntu Clang No Pkcrypt	1m 5s
Ubuntu Clang No Winzip AES	49s
Ubuntu Clang No Encryption	42s
Ubuntu Clang Compress Only	1m 6s
Ubuntu Clang Decompress Only	58s
Ubuntu Clang OpenSSL	55s
Windows MSVC	1m 26s
Windows GCC Code Coverage	5m 2s
macOS Xcode	1m 32s
macOS Xcode Code Coverage	1m 52s
macOS Xcode LibCompression	2m 13s
macOS Xcode OpenSSL	1m 44s
	33m 52s

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