-x monger --install does not work when started with a relative path
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=4867
Reported by Arne Goedeke email@example.com
this happens when starting the pike binary using a relative path, e.g. doing ./pike/bin/pike inside a roxen installation. The monger module uses master()->pike_file_name after changing the current working directory. If pike_file_name is a relative path the binary cannot be found after cd().