Add --ignore-missing and --binary to --help and xxhsum.1 #673

Job	Run time
CC=cc, ubuntu-latest	1m 18s
CC=gcc, ubuntu-latest	1m 9s
CC=gcc-12, ubuntu-22.04	1m 27s
CC=gcc-11, ubuntu-22.04	1m 13s
CC=gcc-10, ubuntu-22.04	1m 27s
CC=gcc-9, ubuntu-22.04	1m 30s
CC=gcc-8, ubuntu-20.04	1m 41s
CC=gcc-7, ubuntu-20.04	1m 38s
CC=clang, ubuntu-latest	1m 11s
CC=clang-12, ubuntu-22.04	1m 17s
CC=clang-11, ubuntu-22.04	1m 39s
CC=clang-10, ubuntu-20.04	1m 9s
CC=clang-9, ubuntu-20.04	1m 23s
CC=clang-8, ubuntu-20.04	1m 27s
CC=clang-7, ubuntu-20.04	1m 27s
CC=clang-6.0, ubuntu-20.04	1m 22s
Linux x64 cmake unofficial build test	11s
Linux x64 check results consistency	25s
Linux x64 misc tests	1m 23s
QEMU ARM	1m 51s
QEMU AARCH64	5m 58s
QEMU PPC64LE	1m 37s
QEMU PPC64	1m 30s
QEMU S390X	2m 46s
QEMU MIPS	1m 36s
QEMU M68K	2m 1s
QEMU RISC-V	1m 42s
QEMU ARM, gcc-10	1m 39s
QEMU AARCH64, gcc-10	4m 19s
QEMU PPC64LE, gcc-10	1m 53s
QEMU PPC64, gcc-10	1m 28s
QEMU S390X, gcc-10	2m 6s
QEMU MIPS, gcc-10	1m 55s
QEMU ARM, gcc-9	1m 46s
QEMU PPC64LE, gcc-9	1m 41s
QEMU PPC64, gcc-9	1m 42s
QEMU S390X, gcc-9	2m 1s
QEMU MIPS, gcc-9	1m 14s
QEMU ARM, gcc-8	1m 46s
QEMU PPC64LE, gcc-8	1m 26s
QEMU PPC64, gcc-8	1m 26s
QEMU S390X, gcc-8	2m 3s
Ubuntu Node 16.x WebAssembly/asm.js tests	1m 4s
Ubuntu Node 17.x WebAssembly/asm.js tests	1m 19s
Ubuntu Node 18.x WebAssembly/asm.js tests	1m 14s
macos-11	1m 28s
macos-12	39s
Windows mingw64	4m 1s
Windows mingw32	5m 56s
VC++ 2022, x64	38s
VC++ 2022, Win32	1m 15s
VC++ 2022, ARM	1m 14s
VC++ 2022, ARM64	1m 4s
VC++ 2019, x64	1m 25s
VC++ 2019, Win32	2m 1s
VC++ 2019, ARM	1m 43s
VC++ 2019, ARM64	2m 0s
	1h 38m 44s

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