hadrian: enable internal-interpreter for ghc-bin stage0

This commit enables internal-interpreter flag for ghc-bin even when
compiling stage0, as long as target supports ghci. It enables ghci
functionality for cross targets that support ghci, since cross ghc-bin
is really stage0.

hadrian/src/Settings/Packages.hs

@@ -107,7 +107,7 @@ packageArgs = do
              , compilerStageOption ghcDebugAssertions ? arg "-DDEBUG" ]
 
           , builder (Cabal Flags) ? mconcat
-            [ andM [expr ghcWithInterpreter, notStage0] `cabalFlag` "internal-interpreter"
+            [ expr ghcWithInterpreter `cabalFlag` "internal-interpreter"
             , ifM stage0
                   -- We build a threaded stage 1 if the bootstrapping compiler
                   -- supports it.