revert cmake file to original (project is called 'vigra' not 'my_vigra')
revert cmake file to original (project is called 'vigra' not 'my_vigra')

DaveRichmond-/vigra,psteinb/vigra,psteinb/vigra,DaveRichmond-/vigra,DaveRichmond-/vigra,psteinb/vigra,psteinb/vigra,DaveRichmond-/vigra,DaveRichmond-/vigra,DaveRichmond-/vigra,DaveRichmond-/vigra,psteinb/vigra,psteinb/vigra,psteinb/vigra