[PATCH] Improve error message on missing GNAT

[Paolo Bonzini]

While testing my --enable-stage1-languages patch, I noticed that if you 
specify --enable-languages=c,ada and you don't have a GNAT installed, 
the error message does not hint to what the problem might be.  For 4.3 I 
plan to simplify a lot the language detection code, in the meanwhile 
here is a simple patch.

This patch was tested with ../configure, ../configure 
--enable-languages=c,ada and ../configure --enable-languages=all,ada on 
a machine without GNAT and one with it.

Ok for mainline?  I will apply this as obvious (Fortran issues the error 
message on a missing GMP) anyway in a week unless anyone says it is not 
appropriate for the regression-only mode.

Paolo
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