* configure.in: Don't use --with-stabs on IRIX 6.

configure.in

@@ -312,6 +312,8 @@ fi
 # Default to using --with-stabs for certain targets.
 if [ x${with_stabs} = x ]; then
   case "${target}" in
+  mips*-*-irix6*)
+    ;;
   mips*-*-* | alpha*-*-osf* | i[3456]86*-*-sysv4* | i[3456]86*-*-unixware*)
     with_stabs=yes;
     withoptions="${withoptions} --with-stabs"