Fix const-qualification in ball_log test driver
Fix const-qualification in ball_log test driver

Windows and Solaris appear to have a version of
'strstr' that insists on trafficking in const
char *, where our other platforms are more
forgiving.

bloomberg/bde,bloomberg/bde,bloomberg/bde,che2/bde,che2/bde,che2/bde,che2/bde,bloomberg/bde,bloomberg/bde