Laurent Rineau 844d824f89 Fix a warning, with recent clang ...

The warning was:

```
/mnt/testsuite/include/CGAL/Straight_skeleton_converter_2.h:177:10: warning: variable 'hit' is incremented both in the loop header and in the loop body [-Wfor-loop-analysis]
      ++ hit ;
         ^
```

2016-06-13 12:53:27 +02:00

..

CGAL

Fix a warning, with recent clang

2016-06-13 12:53:27 +02:00