proposal: drop support for ada on tru64-alpha

[James E Wilson]

Arnaud Charlet wrote:
> I must say I can't find from the bugzilla comments what is the relationship
> between this PR and Ada builds, in particular since this PR seems to
> be g++ specific.

Follow the pointer to PR 13750.  The patch that makes PCH work breaks 
Ada.  So we have to choose between PCH or Ada.  Unless someone is 
willing and able to spend some time figuring out why Ada is broken with 
the patch, so that we can have both.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com