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This reverts commit a35403dc.

But keep the dependency from packagegroup-qt5-toolchain-target, qt5-creator
removed as most people won't really need this. Andreas and meta-qt5-extra
still need qtwebkit as reported here:
https://github.com/meta-qt5/meta-qt5/pull/273#issuecomment-578536852

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>