The ui_XXX.h include did not match the location of the XXX.ui file, and
AUTOUIC failed with
"SRC:/addtorrentdialog.h"
includes the uic file "ui_addtorrentform.h",
but the user interface file "addtorrentform.ui"
could not be found in the following directories
"SRC:"
While this could be fixed by adjusting the include paths properly, this
would complicate the CMake project file, and we're dealing with an
example where needless complexity would cloud comprehensibility.
Move the .ui file next to corresponding source files instead.
This removes the need for any special cases in CMakeLists.txt, and we
can remove .prev_CMakeLists.txt.
Fixes: QTBUG-87457
Pick-to: 6.1
Change-Id: Ic2dec5ded7100e22d5afc571efc4b009bc62e41c
Reviewed-by: Kai Koehne <kai.koehne@qt.io>