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Make generator work for Qt 5.15 #200

Job	Run time
ubuntu (20.04)	16m 47s
windows (win64_mingw73, 3.10, 5.12.*, x64)	4m 2s
macOS (11, 3.6, 5.9.*, release)	3m 6s
ubuntu (22.04)	10m 9s
oldschool (centos, 7, python-debug, debug)	5m 9s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	2m 4s
macOS (11, 3.6, 5.9.*, debug)	7m 27s
oldschool (centos, 7, python-debug, release)	5m 45s
macOS (12, 3.11, 5.12.*, debug)	8m 11s
oldschool (rockylinux, 9, python3-devel, release)	8m 30s
windows (win32_mingw53, 3.6, x86, 5.11.*)	2m 50s
	1h 14m 0s

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