Fix cmake (and possibly autotools) build for:
lib/libqtui.a(interface_tree.cpp.o): In function `SparkLineDelegate':
/home/jmayer/work/wireshark/svn/trunk/ui/qt/sparkline_delegate.h:10: undefined reference to `vtable for SparkLineDelegate'
This would not show up using qtcreator due to the magic of qmake.
I must admit that I don't fully understand what I am doing here, but
I read the following thread to the bottom and one of the last posts
contained the solution:
http://stackoverflow.com/questions/1095298/gcc-c-linker-errors-undefined-reference-to-vtable-for-xxx-undefined-refere
svn path=/trunk/; revision=44280
Alexis La Goutte