Remove unnecessary default constructor definitions #4274

Job	Run time
macos-static	2m 39s
unix (ubuntu-20.04, g++, make)	5m 47s
windows (32, windows-2019)	7m 27s
unix (ubuntu-20.04, g++, cmake)	5m 47s
windows (32, windows-2022)	6m 31s
unix (ubuntu-20.04, clang++, make)	6m 17s
windows (64, windows-2019)	5m 46s
unix (ubuntu-20.04, clang++, cmake)	6m 20s
unix (ubuntu-22.04, g++, make)	6m 18s
unix (ubuntu-22.04, g++, cmake)	6m 14s
windows (64, windows-2022)	6m 39s
unix (ubuntu-22.04, clang++, make)	4m 26s
unix (ubuntu-22.04, clang++, cmake)	4m 23s
unix (macos-14, clang++, make)	5m 53s
unix (macos-14, clang++, cmake)	7m 6s
windows-mingw-build (32)	1m 2s
windows-mingw-build (64)	2m 43s
cygwin (32)	6m 9s
freebsd	5m 34s
cygwin (64)	5m 0s
windows-mingw-testing (windows-2019, 32)	5m 25s
windows-mingw-testing (windows-2019, 64)	4m 43s
windows-mingw-testing (windows-2022, 32)	4m 38s
windows-mingw-testing (windows-2022, 64)	4m 58s
	2h 7m 45s

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