df: Remove support for mounting devices This was marked deprecated in r329092, over two and a half years ago. This functionality is also buggy per PR 237368. PR: 237368 Reviewed by: brooks, cem, emaste, imp Differential Revision: https://reviews.freebsd.org/D27197
head/bin/df/Makefile
head/bin/df/df.1
head/bin/df/df.c