Old *roffs don't support the `ti` special character. Compensate.
Before (DWB, Solaris 10):
The --nethackrc:RC-file option will use RC-file instead of
the default run-time configuration file (typically
/.nethackrc) and the --no-nethackrc option can be used to
skip any run-time configuration file.
Before (Plan 9):
The --nethackrc:RC-file option will use RC-file instead of
the default run-time configuration file (typically
ti/.nethackrc) and the --no-nethackrc option can be used to
skip any run-time configuration file.
After (all):
The --nethackrc:RC-file option will use RC-file instead of
the default run-time configuration file (typically
~/.nethackrc) and the --no-nethackrc option can be used to
skip any run-time configuration file.