kde4support won't compile against today's qtbase-stable

[Treeve Jelbert]

src/CMakeFiles/KF5KDE4Support.dir/kio/kfiledialog.cpp.o: In function 
`KFileDialogQtOverride::~KFileDialogQtOverride()':
kfiledialog.cpp:
(.text._ZN21KFileDialogQtOverrideD2Ev[_ZN21KFileDialogQtOverrideD5Ev]+0x3): 
undefined reference to `qt_filedialog_existing_directory_hook'
kfiledialog.cpp:
(.text._ZN21KFileDialogQtOverrideD2Ev[_ZN21KFileDialogQtOverrideD5Ev]+0x16): 
undefined reference to `qt_filedialog_open_filename_hook'
kfiledialog.cpp:
(.text._ZN21KFileDialogQtOverrideD2Ev[_ZN21KFileDialogQtOverrideD5Ev]+0x29): 
undefined reference to `qt_filedialog_open_filenames_hook'
kfiledialog.cpp:
(.text._ZN21KFileDialogQtOverrideD2Ev[_ZN21KFileDialogQtOverrideD5Ev]+0x3c): 
undefined reference to `qt_filedialog_save_filename_hook'
src/CMakeFiles/KF5KDE4Support.dir/kio/kfiledialog.cpp.o: In function 
`_GLOBAL__sub_I_kfiledialog.cpp':
kfiledialog.cpp:(.text.startup+0x2d): undefined reference to 
`qt_filedialog_existing_directory_hook'
kfiledialog.cpp:(.text.startup+0x3a): undefined reference to 
`qt_filedialog_open_filename_hook'
kfiledialog.cpp:(.text.startup+0x47): undefined reference to 
`qt_filedialog_open_filenames_hook'
kfiledialog.cpp:(.text.startup+0x54): undefined reference to 
`qt_filedialog_save_filename_hook'