Bootstrap failure on Linux/x86-64 in Ada

[Paolo Bonzini]

>
>
>> So, the AIX makefile fragments config/mh-ppc-aix and 
>> config/mt-ppc-aix could not just do
>>
>> ADAFLAGS += -mminimal-toc
>> ADAFLAGS_FOR_TARGET += -mminimal-toc
>
> The Ada Makefile already takes into account $(X_ADAFLAGS) and
> $(T_ADAFLAGS)

Yes, but it provides no way to set them globally.  That means, if 
something is written in Ada, it has to be in gcc/ada, and if you want to 
change some parameter you more or less have to invoke `make' from the 
gcc/ada directory.

I think this is too difficult to clean up, so I am quite inclined to 
revert this part of the patch.

Paolo