[Toybox] [PATCH] ifconfig: add missing flags.

[enh]

I haven't seen these in the wild, but happened to be dealing with the
corresponding header file and realized they were missing here.

IFF_LOWER_UP and IFF_DORMANT were added in Linux 2.6.17, and IFF_ECHO
in Linux 2.6.25.

(I haven't done anything about the missing bounds check here, nor trying
to show any unknown flags in hex or anything.)
---
 toys/net/ifconfig.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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