[Toybox] [PATCH] netstat: various fixes.

[enh]

Avoid fgets() into toybuf other than to skip header lines, preferring
fscanf() or xgetline() instead.

Remove the early returns if we fail to skip a header line (fixes #62).

Fix `netstat -xl` which was previously broken (because only -a would
include listening sockets).

Fix a variety of formatting issues, bringing the diff between toybox
netstat and net-tools netstat down (which was what I used for testing).

Use FLAG() more consistently.
---
 toys/net/netstat.c | 143 ++++++++++++++++++++-------------------------
 1 file changed, 62 insertions(+), 81 deletions(-)
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