Version number fallout, take three

[Paolo Carlini]

Zack Weinberg wrote:

>More testing would be
>appreciated, especially with --enable-version-specific-runtime-libs.
>Comments are greatly appreciated, too.
>  
>
Zack, I'm sorry, but the problem with libstc++-v3 is still there: no 4.1.0
intermerdiate and the installed compiler is not functional for c++ code
using the library.

*Please* try harder to fix this blocker issue: in case you don't hear from
me immediately (due to the timezone or whatever) just try to quickly
compile an "Hello World" after an installation, it's not matter of details.

Thanks,
Paolo.