msi: Use -fno-builtin to avoid warnings with gcc 4.1.1.

[Mike McCormack]

Mike McCormack wrote:

>> Can you file a bug report at
>> http://gcc.gnu.org/bugzilla/
> 
> You're welcome to file a bug report if you like, but I don't consider 
> this worth of one myself.

Oh.  A gcc bug report.  I really should read my mail more carefully :)

I was considering that, bug I didn't have time to research the problem 
further to see if it was really a bug or something else was going on...

Mike