* in games/fortune/strfile/Makefile, build strfile as a
regular program instead of as a host tool;
* add tools/strfile directory to build strfile as a host tool;
* in tools/Makefile, add strfile to SUBDIR list;
* in BSD.*.mk, define TOOL_STRFILE variable;
* in games/fortune/datfiles/Makefile, use TOOL_STRFILE when creating
databases at build time;
* in distrib/sets/lists/games/mi, mention usr/games/strfile.
apb