This reverts commit ccf8a0cfc2b194c07ac0450e0317ae6de1bb0df5.
Bison 2.4 breaks at least libIDL and there is a bug-report that
gcc 4.3.2 build is broken [1] as well, but can not reproduce this.
[1] http://www.mail-archive.com/bug-bison@gnu.org/msg01218.html