nvim: after/ftplugin/rust: Do not add target to buffer list

This can happen when jumping to something which is generated
and is present in the target directory. In wasmtime, a few
types are generated and end up being in the target build
directory.

nvim/.config/nvim/after/ftplugin/rust.lua

@@ -9,7 +9,7 @@ vim.keymap.set('n', 'cbu', ":Dispatch! cargo update<CR>"    , { noremap=true, bu
 vim.keymap.set('n', ',r' , ":CargoReload<CR>"               , { noremap=true, buffer=0 })
 
 vim.api.nvim_create_autocmd({ "BufReadPre", "BufWinEnter" }, {
-  pattern  = { "*/git/checkouts/*", "*/toolchains/*", "*cargo/registry/*" },
+  pattern  = { "*/git/checkouts/*", "*/toolchains/*", "*cargo/registry/*", "*target/*/build/*" },
   callback = function()
     vim.bo.buflisted = false
   end,