Switch to output parse of --version to determine ls flavor

lib/git/shell_shortcuts.sh

@@ -97,7 +97,7 @@ fi
 if [ "$shell_ls_aliases_enabled" = "true" ] && builtin command -v ruby > /dev/null 2>&1; then
   # BSD ls is different to Linux (GNU) ls
   # Test for BSD ls
-  if ! ls --color=auto > /dev/null 2>&1; then
+  if ! (ls --version 2>/dev/null || echo "BSD") | grep GNU >/dev/null 2>&1; then
     # ls is BSD
     _ls_bsd="BSD"
   fi