[Toybox] [PATCH] Add missing `static`s and remove an unused function.

[enh]

---
 toys/net/ftpget.c   |  2 +-
 toys/net/ifconfig.c |  2 +-
 toys/other/acpi.c   |  2 +-
 toys/posix/cp.c     |  2 +-
 toys/posix/cpio.c   |  2 +-
 toys/posix/ls.c     | 11 +++--------
 toys/posix/ps.c     |  2 +-
 7 files changed, 9 insertions(+), 14 deletions(-)
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