Remove unused function createThin() #1127

Job	Run time
cpp-lib-build (macos-12, clang, ON)	5m 17s
cpp-lib-build (macos-12, clang, OFF)	3m 43s
build (macos-12, tool)	1m 30s
cpp-lib-build (macos-12, gcc, ON)	3m 24s
build (macos-12, cpp)	19m 47s
cpp-lib-build (macos-12, gcc, OFF)	8m 22s
build (macos-12, csharp)	8m 13s
cpp-lib-build (ubuntu-20.04, clang, ON)	2m 47s
build (macos-12, dart)	6m 11s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 10s
build (macos-12, go)	4m 28s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 24s
build (macos-12, java)	3m 24s
build (macos-12, javascript)	2m 3s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 16s
build (macos-12, typescript)	15m 29s
cpp-lib-build (windows-2022, clang, ON)	5m 20s
build (macos-12, php)	2m 48s
cpp-lib-build (windows-2022, clang, OFF)	6m 0s
cpp-lib-build (windows-2022, cl)	4m 38s
build (macos-12, python3)	1m 34s
build (ubuntu-20.04, tool)	1m 0s
build (ubuntu-20.04, cpp)	18m 10s
build (ubuntu-20.04, csharp)	5m 30s
build (ubuntu-20.04, dart)	4m 1s
build (ubuntu-20.04, go)	2m 56s
build (ubuntu-20.04, java)	1m 22s
build (ubuntu-20.04, javascript)	4m 3s
build (ubuntu-20.04, typescript)	9m 53s
build (ubuntu-20.04, php)	1m 17s
build (ubuntu-20.04, python3)	1m 11s
build (windows-2022, tool)	1m 29s
build (windows-2022, cpp)	23m 15s
build (windows-2022, csharp)	7m 52s
build (windows-2022, dart)	4m 17s
build (windows-2022, go)	6m 36s
build (windows-2022, java)	4m 1s
build (windows-2022, javascript)	2m 33s
build (windows-2022, typescript)	20m 8s
build (windows-2022, php)	1m 55s
build (windows-2022, python3)	1m 40s
	3h 58m 57s

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