[patch] Fix the bootstrap test when building with --enable-plugins

[Nick Clifton]

Hi Rafael,

> Note that I don't know tcl, so I am likely trying to detect plugin
> support the wrong way.

Actually your code seems pretty reasonable.

> 2009-10-09  Rafael Avila de Espindola  <espindola@google.com>
> 
> 	* bootstrap.exp: Detect if plugins are enabled. Skip the static
> 	link test and add -ldl to the remaining tests if they are.

Approved and applied.  The only change I made was to add a few comments 
to the new pieces of code so that other people will know what is going on.

Cheers
   Nick