Fix a stage symlink.
There may be still some problems with this port:
/usr/local/bin/definitions.K is referring to /wrkdirs/usr/ports/science/cdf/work/stage
/usr/local/bin/definitions.B is referring to /wrkdirs/usr/ports/science/cdf/work/stage
/usr/local/bin/definitions.C is referring to /wrkdirs/usr/ports/science/cdf/work/stage