Fix three warnings (Wunused-parameter, Wsign-compare, Wdeprecated-declarations) and a typo. #951

Job	Run time
build (macos-11, tool)	1m 43s
cpp-lib-build (macos-11, clang, ON)	1m 4s
build (macos-11, cpp)	26m 17s
cpp-lib-build (macos-11, clang, OFF)	4m 31s
build (macos-11, csharp)	9m 29s
cpp-lib-build (macos-11, gcc, ON)	1m 7s
build (macos-11, dart)	5m 19s
build (macos-11, go)	4m 32s
cpp-lib-build (macos-11, gcc, OFF)	4m 32s
build (macos-11, java)	2m 4s
cpp-lib-build (ubuntu-20.04, clang, ON)	55s
build (macos-11, javascript)	2m 30s
cpp-lib-build (ubuntu-20.04, clang, OFF)	1m 11s
build (macos-11, typescript)	19m 42s
build (macos-11, php)	13m 59s
cpp-lib-build (ubuntu-20.04, gcc, ON)	1m 5s
build (macos-11, python3)	2m 4s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	1m 5s
build (ubuntu-20.04, tool)	57s
cpp-lib-build (windows-2022, clang, ON)	4m 33s
build (ubuntu-20.04, cpp)	15m 14s
cpp-lib-build (windows-2022, clang, OFF)	5m 56s
build (ubuntu-20.04, csharp)	5m 2s
cpp-lib-build (windows-2022, cl)	4m 37s
build (ubuntu-20.04, dart)	3m 27s
build (ubuntu-20.04, go)	2m 22s
build (ubuntu-20.04, java)	1m 4s
build (ubuntu-20.04, javascript)	1m 35s
build (ubuntu-20.04, typescript)	10m 8s
build (ubuntu-20.04, php)	1m 15s
build (ubuntu-20.04, python3)	1m 7s
build (windows-2022, tool)	1m 29s
build (windows-2022, cpp)	24m 37s
build (windows-2022, csharp)	7m 22s
build (windows-2022, dart)	4m 24s
build (windows-2022, go)	5m 30s
build (windows-2022, java)	2m 38s
build (windows-2022, javascript)	2m 24s
build (windows-2022, typescript)	23m 38s
build (windows-2022, php)	2m 1s
build (windows-2022, python3)	2m 3s
	3h 56m 32s

Provide feedback