Split out wayland-doc subpackage for documentation
Instead of using a confusingly named 'wayland' subpackage just for
shipping development documentation, put it in 'wayland-doc' and drop the
'wayland' subpackage.
As a side effect, this also fixes the build on F24 with rpm 4.12.90
which would otherwise fail with:
RPM build errors:
Macro expanded in comment on line 123: #doc %{_datadir}/doc/wayland/*
Installed (but unpackaged) file(s) found:
/usr/share/doc/wayland/Wayland/en-US/html/Wayland.proc
/usr/share/doc/wayland/Wayland/en-US/html/apa.html
[snip, hundreds of documentation files cut out]