Speed up `compopt' availability detection.

Used `type compopt' instead of `compopt' to detect availability of
compopt because (at least on Ubuntu) a python-command-not-found handler
is started when issuing a non-existing command, thus resulting in
considerable slower completions on systems without compopt (bash < 4.0).

CHANGES

@@ -12,6 +12,7 @@ bash-completion (2.x)
 
   [ Freddy Vulto ]
   * Added _tilde(), fix ~username completion (Alioth: #312613, Debian: #587095)
+  * Speed up `compopt' availability detection
 
  -- David Paleino <d.paleino@gmail.com>  Wed, 16 Jun 2010 17:53:22 +0200
 

bash_completion

@@ -642,7 +642,7 @@ _filedir()
         toks=( ${toks[@]-} $( compgen -f -X "$xspec" -- $quoted) )
         if [ ${#toks[@]} -ne 0 ]; then
             # If `compopt' is available, set `-o filenames'
-            compopt &>/dev/null && compopt -o filenames ||
+            type compopt &>/dev/null && compopt -o filenames ||
             # No, `compopt' isn't available;
             # Is `-o filenames' set?
             [[ (