dejagnu framework

[Benjamin Kosnik]

> Why should you?  Isn't it part of the libstdc++-v3 testsuite?  If you
> ran it as part of check-g++, it would run twice.

mark, jason et. al wanted to be able to run the libstdc++-v3 testsuite 
and just the c++ testsuite. That's why 'make check-g++' is supposed to do 
that.

hmm. maybe another way to do this:

make check-target-g++ == test g++
make check-target-libstdc++-v3 == test v3
make check-target-c++ == test both g++ and v3

we could do this with pretty simple makefile hacks.

-benjamin