MacOS installer: don't quote XCODE_EXTRA_CONFIGURE_ARGS

distrib/MacOS/GHC.xcodeproj/project.pbxproj

@@ -152,7 +152,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "# We need to be at the top of the ghc tree\ncd ../..\n\nPREFIX=${INSTALL_PATH}/${CONTENTS_FOLDER_PATH}/usr\n\nif [ ${ACTION} = build ]; then\n  # put explicit --prefix last, in case the extra configure args contain a prefix\n  ./configure \"${XCODE_EXTRA_CONFIGURE_ARGS}\" --prefix=${PREFIX} || exit 1\n  MAKE_ACTION=\n  DOCS_ACTION=html\nelse\n  MAKE_ACTION=${ACTION}\n  DOCS_ACTION=install-docs\nfi\n\n# - Yes, it's the vanilla install target that must see HADDOCK_DOCS=YES, not the install-docs target.\n# - We must explictly force the creation of a symbol table in .a files on BSD, and not all versions of Cabal\n#   do that consistently; hence, the EXTRA_AR_ARGS.\nmake DESTDIR=${DSTROOT} HADDOCK_DOCS=YES EXTRA_AR_ARGS=-s ${MAKE_ACTION} || exit 1\nmake DESTDIR=${DSTROOT} XMLDocWays=html ${DOCS_ACTION} || exit 1";
+			shellScript = "# We need to be at the top of the ghc tree\ncd ../..\n\nPREFIX=${INSTALL_PATH}/${CONTENTS_FOLDER_PATH}/usr\n\nif [ ${ACTION} = build ]; then\n  # put explicit --prefix last, in case the extra configure args contain a prefix\n  ./configure ${XCODE_EXTRA_CONFIGURE_ARGS} --prefix=${PREFIX} || exit 1\n  MAKE_ACTION=\n  DOCS_ACTION=html\nelse\n  MAKE_ACTION=${ACTION}\n  DOCS_ACTION=install-docs\nfi\n\n# - Yes, it's the vanilla install target that must see HADDOCK_DOCS=YES, not the install-docs target.\n# - We must explictly force the creation of a symbol table in .a files on BSD, and not all versions of Cabal\n#   do that consistently; hence, the EXTRA_AR_ARGS.\nmake DESTDIR=${DSTROOT} HADDOCK_DOCS=YES EXTRA_AR_ARGS=-s ${MAKE_ACTION} || exit 1\nmake DESTDIR=${DSTROOT} XMLDocWays=html ${DOCS_ACTION} || exit 1";
 		};
 		E76B00450D52DFDB00A05A2F /* ShellScript */ = {
 			isa = PBXShellScriptBuildPhase;