vim-patch:9.0.0195: metafun files are not recogized (#19746)

Problem:    Metafun files are not recogized.
Solution:   Add filetype detection patterns.
9032b9ceb6

runtime/lua/vim/filetype.lua

@@ -668,6 +668,21 @@ local extension = {
   moo = 'moo',
   moon = 'moonscript',
   mp = 'mp',
+  mpiv = function(path, bufnr)
+    return 'mp', function(b)
+      vim.b[b].mp_metafun = 1
+    end
+  end,
+  mpvi = function(path, bufnr)
+    return 'mp', function(b)
+      vim.b[b].mp_metafun = 1
+    end
+  end,
+  mpxl = function(path, bufnr)
+    return 'mp', function(b)
+      vim.b[b].mp_metafun = 1
+    end
+  end,
   mof = 'msidl',
   odl = 'msidl',
   msql = 'msql',