remove unused/inexistant "lvalue": makes newer bisons choke


git-svn-id: https://insight.labri.fr/svn/trunk@927 00316523-1ed1-4fdc-9313-76483a3f41dc
unbreak configure script on MacOS X and make it more silent on objdump
failure


git-svn-id: https://insight.labri.fr/svn/trunk@928 00316523-1ed1-4fdc-9313-76483a3f41dc