Fix fixed rounding around zero in Dragon #5821

Job	Run time
mingw (mingw64)	4m 26s
build (windows-2019, Win32, v142, 17, Debug)	2m 12s
mingw (ucrt64)	4m 38s
build (windows-2019, Win32, v142, 17, Release)	2m 47s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	2m 14s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 42s
build (windows-2019, x64, v140, 14, Debug)	1m 31s
build (windows-2019, x64, v140, 14, Release)	2m 32s
build (windows-2019, x64, v141, 17, Debug)	2m 2s
build (windows-2019, x64, v141, 17, Release)	2m 36s
build (windows-2019, x64, v142, 17, Debug)	1m 47s
build (windows-2019, x64, v142, 17, Release)	2m 27s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 30s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 42s
build (windows-2019, x64, v142, 20, Debug)	1m 55s
build (windows-2019, x64, v142, 20, Release)	2m 51s
build (windows-2022, x64, v143, Debug, 20)	2m 9s
	43m 1s

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