lupdate does not handle \ end of line terminators in C++ source code

To reproduce this, create some C++ source file that contains a long tr( string that spans several lines and uses the \ to denote the line end.

e.g.
return tr( "some text\
more text");

You will receive something similar to the following:-

C:\32241\HelloWorldQtUic>lupdate HelloWorldQtUic.pro
Unknown feature http://qtsoftware.com/xml/features/report-whitespace-only-CharDa
ta
C:/32241/HelloWorldQtUic/main.cpp:10: Unterminated C++ string
C:/32241/HelloWorldQtUic/main.cpp:11: Unterminated C++ string
C:/32241/HelloWorldQtUic/main.cpp:10: Unbalanced parentheses in C++ code (or abu
se of the C++ preprocessor)

Updating 'HelloWorldQtUic_en.ts'...

Found 3 source text(s) (1 new and 2 already existing)
Similar-text heuristic provided 1 translation(s)

This was reproduced on 4.5.1 and 4.5.2 using Windows with VS2005