[Toybox] [PATCH] gzip: reject non-gzip files in zlib path.

[enh]

It turns out that zlib defaults to just copying data verbatim if the
input isn't in gzip format, rather than rejecting it. Explicitly add a
check that zlib isn't doing that. (The toybox inflation path already
errors out.)

Also add the missing test.
---
 tests/gzip.test | 3 +++
 toys/lsb/gzip.c | 1 +
 2 files changed, 4 insertions(+)
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