Revert "Suppress duplicate .T files"
Revert "Suppress duplicate .T files"

This reverts commit 9a29b65bda8aed4c5fdbff25866ddf2dd1583210.

It turns out that while not harmful, that commit is unnecessary,
and a `make clean` resolved it. See:
https://phabricator.haskell.org/rGHC9a29b65bda8aed4c5fdbff25866ddf2dd1583210

shlevy/ghc,olsner/ghc,sdiehl/ghc,shlevy/ghc,ezyang/ghc,shlevy/ghc,ezyang/ghc,ezyang/ghc,olsner/ghc,shlevy/ghc,ezyang/ghc,sdiehl/ghc,shlevy/ghc,olsner/ghc,olsner/ghc,shlevy/ghc,olsner/ghc,sdiehl/ghc,sdiehl/ghc,shlevy/ghc,ezyang/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,sdiehl/ghc,olsner/ghc,ezyang/ghc,olsner/ghc