[File] Suboptimal detection of various LibreOffice zip-based files

[Christoph Biedl]

Gioele Barabucci wrote...

> file 5.46 misdetects (or, better, suboptimally detects) some files used or
> produced by LibreOffice. The following examples are taken from the Debian
> package libreoffice-common [1], directory `/usr/lib/libreoffice/share/`.

FWIW, the palette/standard.so[bp] are indentified mildly differently
here, "Java archive data (JAR)" and "Zip archive data, made by v3.0
UNIX, extract using at least v1.0, last modified Mar 06 2020 00:05:56,
uncompressed size 0, method=store". Using file with today's HEAD.

Still that certainly could see an improvement.

> Would it be possible to extend the file command and the magic file to detect
> them as separate file types?

You can help a lot here by providing a file format description. As they
all are .zip files, are there specific files inside that container?
Other bits that could be used for identification?

    Christoph