Bug#713944: clang-3.2: depends on non-existent package libstdc++6-4.8-dev

[Bastien Montagne]

Sorry, It’s me who “invented” that libstdc++6-4.8-dev package in my bug 
report (712520), didn’t double check the 4.8 package name (wonder why it 
was changed from 4.6/4.7 series, though)… :(

Bastien