enhance(runtime): Enable completion for lua files

Enabled for `:colorscheme` `:compiler` filetype

src/nvim/vim.h

@@ -313,6 +313,7 @@ enum { FOLD_TEXT_LEN = 51 };  //!< buffer size for get_foldtext()
 #define DIP_NORTP 0x20  // do not use 'runtimepath'
 #define DIP_NOAFTER 0x40  // skip "after" directories
 #define DIP_AFTER   0x80  // only use "after" directories
+#define DIP_LUA  0x100    // also use ".lua" files
 
 // Lowest number used for window ID. Cannot have this many windows per tab.
 #define LOWEST_WIN_ID 1000