Fix three warnings (Wunused-parameter, Wsign-compare, Wdeprecated-declarations) and a typo. #950

Job	Run time
cpp-lib-build (macos-11, clang, ON)	4m 27s
build (macos-11, tool)	1s
cpp-lib-build (macos-11, clang, OFF)	4m 21s
cpp-lib-build (macos-11, gcc, ON)	4m 26s
build (macos-11, cpp)	4m 26s
cpp-lib-build (macos-11, gcc, OFF)	4m 22s
build (macos-11, csharp)	1s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 0s
build (macos-11, dart)	1s
cpp-lib-build (ubuntu-20.04, clang, OFF)	2m 43s
build (macos-11, go)	1s
cpp-lib-build (ubuntu-20.04, gcc, ON)	4m 13s
build (macos-11, java)	1s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 14s
build (macos-11, javascript)	1s
build (macos-11, typescript)	1s
cpp-lib-build (windows-2022, clang, ON)	4m 18s
build (macos-11, php)	1s
cpp-lib-build (windows-2022, clang, OFF)	4m 24s
build (macos-11, python3)	1s
cpp-lib-build (windows-2022, cl)	4m 38s
build (ubuntu-20.04, tool)	58s
build (ubuntu-20.04, cpp)	4m 25s
build (ubuntu-20.04, csharp)	4m 16s
build (ubuntu-20.04, dart)	3m 37s
build (ubuntu-20.04, go)	2m 14s
build (ubuntu-20.04, java)	1m 9s
build (ubuntu-20.04, javascript)	1m 20s
build (ubuntu-20.04, typescript)	3m 10s
build (ubuntu-20.04, php)	1m 33s
build (ubuntu-20.04, python3)	1m 6s
build (windows-2022, tool)	1s
build (windows-2022, cpp)	3m 31s
build (windows-2022, csharp)	1m 5s
build (windows-2022, dart)	1m 14s
build (windows-2022, go)	2m 21s
build (windows-2022, java)	1m 42s
build (windows-2022, javascript)	3s
build (windows-2022, typescript)	1s
build (windows-2022, php)	54s
build (windows-2022, python3)	1s
	1h 24m 22s

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