[patch/testsuite/cp] exception.exp: partially refurbish

[Michael Elizabeth Chastain]

mec> ! # The interesting compiler flags are: "aCC +A -Wl,-a-archive" .
drow> That's -Wl,-a,archive.

More evidence that I was hacking (in the bad sense) when I should
have been sleeping.  :-l

Thanks, I'll fix it.

Michael C