patch(1): sync with FreeBSD to version 2.0-12u11

Summary of notable changes from previous sync:

- add -Vnone option to disable backup files
- avoid infinite loop asking for a filename
- add support

patch(1): sync with FreeBSD to version 2.0-12u11

Summary of notable changes from previous sync:

- add -Vnone option to disable backup files
- avoid infinite loop asking for a filename
- add support for git generated diffs
- don't overrun line buffer in some cases
- fix the file removal test
- give /dev/null patches special treatment

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Use <fcntl.h> instead of <sys/file.h> for open()'s prototype and flags.

patch(1): Check for _DIRENT_HAVE_D_NAMLEN availability.