Bug#35074: general: libstdc++2.9-dev priority should be downgraded

[Jonathan P Tomer <phouchg@cif.rochester.edu>]

Package: general
Version: N/A

libstdc++2.9-dev is still priority Standard, which doesn't make much sense
as it can't coexist with c++ on a glibc2.1 system.

-- System Information
Debian Release: potato
Kernel Version: Linux d185d0f4f 2.0.34 #2 Thu Jul 9 10:57:48 EST 1998 i586 unknown