Add C++14 compatibility option (for legacy environment support) #1221

Job	Run time
iOS	50s
emscripten	1m 56s
android (ON)	6m 15s
linux (clang, clang++, Debug)	6m 42s
android (OFF)	5m 41s
Linux Backcompat	16m 17s
linux (clang, clang++, Release)	6m 47s
linux (gcc, g++, Debug)	6m 58s
linux-asan (gcc, g++, Debug, -fsanitize=address)	8m 44s
linux (gcc, g++, Release)	6m 9s
macos (macos-14, clang, clang++, Debug)	5m 0s
linux-asan (gcc, g++, Debug, -fsanitize=thread)	13m 24s
linux-shared (clang, clang++, Release)	1m 48s
macos (macos-14, clang, clang++, Release)	3m 32s
linux-asan (gcc, g++, Debug, -fsanitize=undefined)	9m 13s
linux-shared (gcc, g++, Release)	1m 52s
macos (macos-13, clang, clang++, Debug)	6m 48s
macos-shared (macos-14, clang, clang++, Release)	4m 1s
macos (macos-13, clang, clang++, Release)	9m 34s
windows (windows-2019, windows, Debug)	4m 0s
windows-shared (windows-2019, windows, Debug)	3m 12s
windows (windows-2019, windows, Release)	5m 5s
windows-shared (windows-2019, windows, Release)	5m 9s
	2h 18m 57s

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