Remove unused function createThin() #1126

Job	Run time
cpp-lib-build (macos-12, clang, ON)	3m 18s
cpp-lib-build (macos-12, clang, OFF)	5m 29s
build (macos-12, tool)	2m 8s
build (macos-12, cpp)	21m 6s
build (macos-12, csharp)	8m 0s
cpp-lib-build (macos-12, gcc, ON)	6m 54s
build (macos-12, dart)	5m 15s
cpp-lib-build (macos-12, gcc, OFF)	6m 2s
build (macos-12, go)	3m 13s
cpp-lib-build (ubuntu-20.04, clang, ON)	2m 52s
build (macos-12, java)	4m 15s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 7s
build (macos-12, javascript)	2m 17s
build (macos-12, typescript)	17m 46s
build (macos-12, php)	3m 36s
build (macos-12, python3)	1m 41s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 36s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 23s
build (ubuntu-20.04, tool)	3m 26s
build (ubuntu-20.04, cpp)	17m 37s
cpp-lib-build (windows-2022, clang, ON)	4m 49s
build (ubuntu-20.04, csharp)	5m 20s
cpp-lib-build (windows-2022, clang, OFF)	5m 50s
build (ubuntu-20.04, dart)	3m 56s
cpp-lib-build (windows-2022, cl)	3m 55s
build (ubuntu-20.04, go)	2m 40s
build (ubuntu-20.04, java)	1m 25s
build (ubuntu-20.04, javascript)	1m 59s
build (ubuntu-20.04, typescript)	10m 14s
build (ubuntu-20.04, php)	1m 36s
build (ubuntu-20.04, python3)	1m 25s
build (windows-2022, tool)	1m 33s
build (windows-2022, cpp)	23m 5s
build (windows-2022, csharp)	8m 23s
build (windows-2022, dart)	4m 20s
build (windows-2022, go)	6m 7s
build (windows-2022, java)	4m 27s
build (windows-2022, javascript)	2m 34s
build (windows-2022, typescript)	18m 35s
build (windows-2022, php)	2m 38s
build (windows-2022, python3)	1m 48s
	4h 2m 40s

Provide feedback