autotools: Fix doc_DATA install.
Both the generated format specification document and the static html documents depend on the logo in fish_xiph_org.png. Unfortunately we can't list them both in their respective dependencies because both are passed to doc_DATA for installation and automake doesn't seem to remove duplicates, causing /usr/bin/install to complain about the overwrite. I couldn't find a good solution to this. Wrapping the doc_DATA value in GNU make's $(sort /list/) function would work, but automake warns about the non-portable construct. Instead, I've just removed it from the spec dependency list and appended it manually.
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