[Cpp] CMake: use variables for specifying install paths consistently #1121

Job	Run time
cpp-lib-build (macos-12, clang, ON)	5m 6s
cpp-lib-build (macos-12, clang, OFF)	8m 39s
build (macos-12, tool)	1m 41s
cpp-lib-build (macos-12, gcc, ON)	4m 40s
build (macos-12, cpp)	31m 41s
cpp-lib-build (macos-12, gcc, OFF)	4m 36s
build (macos-12, csharp)	11m 6s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 0s
build (macos-12, dart)	7m 23s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 23s
build (macos-12, go)	3m 27s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 31s
build (macos-12, java)	4m 37s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 13s
build (macos-12, javascript)	1m 51s
cpp-lib-build (windows-2022, clang, ON)	3m 16s
build (macos-12, typescript)	15m 24s
cpp-lib-build (windows-2022, clang, OFF)	4m 53s
build (macos-12, php)	3m 9s
cpp-lib-build (windows-2022, cl)	4m 26s
build (macos-12, python3)	1m 49s
build (ubuntu-20.04, tool)	3m 28s
build (ubuntu-20.04, cpp)	17m 38s
build (ubuntu-20.04, csharp)	5m 46s
build (ubuntu-20.04, dart)	3m 53s
build (ubuntu-20.04, go)	2m 53s
build (ubuntu-20.04, java)	1m 20s
build (ubuntu-20.04, javascript)	1m 43s
build (ubuntu-20.04, typescript)	10m 7s
build (ubuntu-20.04, php)	1m 43s
build (ubuntu-20.04, python3)	1m 45s
build (windows-2022, tool)	1m 22s
build (windows-2022, cpp)	22m 7s
build (windows-2022, csharp)	6m 25s
build (windows-2022, dart)	4m 34s
build (windows-2022, go)	6m 45s
build (windows-2022, java)	3m 59s
build (windows-2022, javascript)	2m 31s
build (windows-2022, typescript)	18m 47s
build (windows-2022, php)	1m 58s
build (windows-2022, python3)	1m 32s
	4h 12m 7s

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