Remove obsolete ifdefs from examples #4817

Job	Run time
clang-format	14s
linux_clang-14_cuda-11.2_debug_analysis	13m 28s
windows_cl-2022_debug_analysis	15m 41s
macos_xcode-14.2_debug_analysis	31m 38s
linux_gcc-12_debug_analysis	14m 23s
macos_xcode-14.2_release	19m 33s
macos_xcode-14.3.1_debug	15m 25s
windows_cl-2022_release	18m 17s
windows_cl-2022_debug	12m 52s
linux_gcc-9_debug	14m 15s
linux_gcc-12_release_c++20	13m 44s
linux_gcc-13_debug	11m 20s
linux_clang-10_release	10m 0s
linux_clang-12_release	30m 26s
linux_clang-13_debug	7m 32s
linux_clang-16_debug_ubsan	10m 0s
linux_clang-16_debug_tsan	11m 44s
	4h 10m 32s

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