Find attached a patch to fix some gawk issues :
- PreReq -> Requires(...)
- Move "make check" to %check section
- Remove generic INSTALL instructions
- Fix %{_datadir} presence in %files that owned too many files

That last point is the important one, since the package was listing many files
twice at build time (man pages, info files, lang...), included directories not
supposed to be owned, and included a non listed info file as a side effect.