Emulate positive dst for timezones like Dublin #30

Job	Run time
linux / build	22m 19s
linux / build32	15m 20s
linux / buildarmappimage64 (i386, armhf, amd64, arm64)	9m 44s
linux / bookworm ( x86 )	8m 6s
linux / bookworm ( armhf )	7m 54s
linux / buildbusterappimage (i386, armhf, amd64, arm64)	7m 16s
macOS / buildangle	20s
linux / bookworm ( x86_64 )	11m 5s
macOS / build-libcxx32	15m 27s
linux / bookworm ( arm64 )	10m 8s
macOS / build-libcxx64	13m 51s
macOS / buildopenssl32	6m 25s
macOS / buildopenssl64	8m 55s
macOS / build-protobuf	9m 29s
macOS / build-m1 / angle (macos-latest, 11.0, arm64)	39m 43s
macOS / build-m1 / openssl (macos-latest, 11.0, arm64, darwin64-arm64)	9m 9s
macOS / buildopenssl	16s
macOS / build-libcxx	27s
macOS / build-m1 / build (false, macos-latest, arm64, 11.0, {}, brew install autoconf automake echo 'set(CMAKE_SYSTE...	4m 4s
linux / publish	0s
macOS / build (10.10.0, 0, http://download.qt.io/online/qtsdkrepository/mac_x64/desktop/qt5_592/, 5.9.2, ...	22m 41s
macOS / build (10.12.0, 1, http://download.qt.io/online/qtsdkrepository/mac_x64/desktop/qt5_5113/, 5.11.3...	19m 10s
macOS / build (10.13.0, 2, http://download.qt.io/online/qtsdkrepository/mac_x64/desktop/qt5_5150/, 5.15.0...	17m 36s
macOS / publish	0s
	4h 19m 25s

Provide feedback