Setup.hs: import configure

Rather than running make, which runs configure, let Setup.hs just include
the configure code. The standalone configure is retained for use by the
Makefile.

This may work better with cabal-dev, since it avoids the Makefile running
ghc, and lets cabal handle all the compiler running, with whatever
flags it uses to expose dependencies.

Setup.hs

@@ -3,15 +3,10 @@
 import Distribution.Simple
 import System.Cmd
 
-main = defaultMainWithHooks simpleUserHooks {
-	preConf = makeSources,
-	postClean = makeClean
-}
+import qualified Build.Configure as Configure
 
-makeSources _ _ = do
-	system "make sources"
+main = defaultMainWithHooks simpleUserHooks { preConf = configure }
+
+configure _ _ = do
+	Configure.run Configure.tests
 	return (Nothing, [])
-
-makeClean _ _ _ _ = do
-	system "make clean"
-	return ()