[Ada] Do not run c52103x, c52104x and c52104y

[Arnaud Charlet]

> The 3 testcases require -fstack-check to pass with GCC 4.1 and later, and 
> stack checking doesn't work very well in 4.x.
> 
> OK for mainline and 4.1 branch?

Could you also modify the driver to indeed compile these tests with
-fstack-check, so that when we remove them from norun.lst, the tests
will run ?

Otherwise OK.

> 2006-01-23  Eric Botcazou  <ebotcazou@adacore.com>
> 
> 	PR ada/20548
> 	* ada/acats/norun.lst: Add c52103x, c52104x and c52104y.