Add Intel processor support to the Darwin port of GNAT

[Arnaud Charlet]

> The following patch is applied to gcc/ada/Makefile.in. The new file  
> is placed in the gcc/ada directory. The patch and file adds Intel  
> processor support to the Darwin port of GNAT. Tested on i686-apple- 
> darwin8.

Would be interesting to see ACATS results as Eric said.

Also, it's easier to deal with straight attachments rather than gzipped
ones which require extra steps.

> 2006-03-11  Andrew W. Reynolds  <awreynolds@mac.com>
> 
> 	* Makefile.in: Add Intel support for Darwin.
> 	* system-darwin-x86.ads: New file.