[CMake] Zero coverage being reported on gcc/Linux builds.

[Kent Williams]

cmake: 2.8.6
gcc/g++: 4.4.6-3
Red Hate Enterprise Linux 6.2

I follow the instructions here: http://www.cmake.org/Wiki/CTest/Coverage

And I have 2 different dashboards that report zero coverage:

http://testing.psychiatry.uiowa.edu/CDash/index.php?project=BRAINSStandalone
http://testing.psychiatry.uiowa.edu/CDash/index.php?project=ANTS

I don't know what's going on because I remember coverage working, and
it's obviously doing something for other projects, e.g. ITK:
http://public.kitware.com/dashboard.php?name=itk

Call me an idiot, but I can follow instructions, and following the
instructions I can find isn't doing the trick.