Add ghc-in-ghci for stack based builds

hadrian/ghci.stack.sh

+#!/usr/bin/env sh
+
+set -e
+
+GHC_FLAGS="$GHC_FLAGS $(TERM=dumb CABFLAGS=-v0 "hadrian/build.stack.sh" tool-args -q --build-root=.hadrian_ghci --flavour=ghc-in-ghci "$@")"
+stack exec -- ghci $GHC_FLAGS "$@" -fno-code -fwrite-interface -hidir=.hadrian_ghci/interface -O0 ghc/Main.hs +RTS -A128m