[Toybox] [PATCH] readelf: various fixes.

[enh]

Add -e, and stop documenting no-op -W.

Fix sign issues, and add a few extra sanity checks.

Redo the BE/LE 16/32/64 reading.

Remove the NOSPACE=1 from the -l test, and fix the -l code to match the
binutils output. Most usefully, this fixes the weird way the NULL
section's empty name would cause misalignment in the section to segment
mapping output.

Add a test for -s (symbol table).
---
 tests/readelf.test     |  19 +++-
 toys/pending/readelf.c | 252 +++++++++++++++++++++++------------------
 2 files changed, 160 insertions(+), 111 deletions(-)
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