[PATCH][Ada] Add option to gnatlink to fix gnat.dg on some platforms

[Eric Botcazou]

> Under what scenario? For the compiler after the first install:
>
> ln -sf ...build...cc1 ...install...cc1

So, in the end, you're not really installing the new compiler, are you?  Fixed 
header files, startup objects, multiple libgccs, etc.

-- 
ric Botcazou