[PATCH, c++] tweak wording of `unknown type' in error messages

[Alexandre Oliva]

Unknown type is not something that necessarily makes sense to end
users, since it's just an internal representation detail of types yet
to undergo overload resolution.  Some users seemed to be confused at
it, so I figured tweaking the wording a bit could make the problem
clearer.

Tested on amd64-linux-gnu.  Ok to install?

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}