chore: use `uname` in ARCHFLAGS in .zshrc template (#12563)

templates/zshrc.zsh-template

@@ -89,7 +89,7 @@ source $ZSH/oh-my-zsh.sh
 # fi
 
 # Compilation flags
-# export ARCHFLAGS="-arch x86_64"
+# export ARCHFLAGS="-arch $(uname -m)"
 
 # Set personal aliases, overriding those provided by Oh My Zsh libs,
 # plugins, and themes. Aliases can be placed here, though Oh My Zsh