Fix arch detection on macos

scripts/bootstrap/bootstrap-haskell

@@ -39,7 +39,6 @@ case "${plat}" in
 			;;
 		*)
 			: "${GHCUP_INSTALL_BASE_PREFIX:=$HOME}"
-			export GHCUP_USE_XDG_DIRS
 
 			if [ -n "${GHCUP_USE_XDG_DIRS}" ] ; then
 				GHCUP_DIR=${XDG_DATA_HOME:=$HOME/.local/share}/ghcup
@@ -223,7 +222,8 @@ download_ghcup() {
             if freebsd-version | grep -E '^12.*' ; then
                 freebsd_ver=12
             elif freebsd-version | grep -E '^13.*' ; then
-                freebsd_ver=13
+                # TODO: missing FreeBSD13 version
+                freebsd_ver=12
             else
                 die "Unsupported FreeBSD version! Please report a bug at https://gitlab.haskell.org/haskell/ghcup-hs/-/issues"
             fi
@@ -237,10 +237,12 @@ download_ghcup() {
 				*) die "Unknown architecture: ${arch}"
 					;;
 			esac
-			_url=${base_url}/${ghver}/x86_64-portbld-freebsd${freebsd_ver}-ghcup-${ghver}
+			_url=${base_url}/${ghver}/x86_64-freebsd${freebsd_ver}-ghcup-${ghver}
             ;;
         "Darwin"|"darwin")
-			case "${arch}" in
+            # uname -m and arch seem to behave different under rosetta
+            # https://superuser.com/questions/835514/why-do-uname-p-and-uname-m-and-arch-output-different-architectures
+            case "$(arch)" in
 				x86_64|amd64)
 					_url=${base_url}/${ghver}/x86_64-apple-darwin-ghcup-${ghver}
 					;;