[bug #44891] gropdf use of Compress::Zlib is not documented as a dependency

[Deri James]

Follow-up Comment #2, bug #44891 (project groff):

Gropdf uses Zlib in two places, once when writing a "stream", and again when
reading a stream (happens when you insert a graphic which is a pdf file). In
both cases I don't think it is absolutely necessary, if you use the -d flag
pdfs are not compressed anyway, and on reading pdfs if a different compression
other than deflate is used then it just leaves it alone and passes it "as is"
to the writer.

So I will make a change which checks for Compress::Zlib and if not found
outputs a suitable warning to stderr but continues to produce an uncompressed
pdf as if the -d flag was set.

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