check-exact is built in-tree

Might be related to #19606 (closed)

% ls utils/check-exact 
check-exact.cabal  ExactPrint.hs  ghc.mk  Lookup.hs  Main.hs  Parsers.hs  Preprocess.hs  README  run.sh  Transform.hs  Types.hs  Utils.hs


% ./hadrian/build --jobs=16 --build-root=_build --flavour=quick _build/test/bin/check-exact
...

% ls utils/check-exact                               
check-exact.cabal  ExactPrint.hs  ghc.mk     Lookup.hs	Main.hi  Main.o      Parsers.hs  Preprocess.hi	Preprocess.o  run.sh	    Transform.hs  Types.hi  Types.o   Utils.hs
ExactPrint.hi	   ExactPrint.o   Lookup.hi  Lookup.o	Main.hs  Parsers.hi  Parsers.o	 Preprocess.hs	README	      Transform.hi  Transform.o   Types.hs  Utils.hi  Utils.o