[ia64] graphics/dri breaks poudriere bulk

[Marcel Moolenaar]

Guys,

Attached a fix for ia64 to graphics/dri to make sure DRI_DRIVERS
is set. Without it poudriere terminates prematurely. It seems
all drivers compile just fine and graphics/dri now installs fine
as well. This is without WITH_NEW_XORG.

For the WITH_NEW_XORG case, graphics/dri fails for reasons other
than simple compilation problems on ia64. In fact, it looks like
a generic problem. I couldn't therefore test the patch.

Please commit at your earliest convenience.

-- 
Marcel Moolenaar
marcel at xcllnt.net
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