misc/gwhich: update GNU which to the latest version 2.25
- Bug fix for an out of bounds stack read (by Daniel Anderson)
- Scripts regenerated with automake 1.18.1 and autoconf 2.73
- Install a bunch of documentation files and convert EXAMPLES option into DOCS (one file does not warrant this separation)
- While here, provide a more sensible and useful COMMENT text
Reported by: portscout