graphics/dspdfviewer: simplify logic for -Wno-error=extra-semi-stmt
I first bogusly added OSVERSION < 1300000 at the end, but in hindsight
and from looking at svnweb the version logic after 11.3 EOL is
v >= 1300014 || (v in 1104000 .. 1200000) || v >= 1201000
==
(v in 1104000 .. 1200000) || v >= 1201000
==
(v >= 1200000 && v < 1201000)
So the port should not relax the check on (early) 12.0, which we can as
well leave out.
While here, add a note about upstream #191 still being open.
Phabricator: D26646
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