[ros-diffs] [cfinck] 41826: - Fix confusion between %_ROSBE_ROSPREFIX% and %_ROSBE_PREFIX% introduced in the last commit. We only use %_ROSBE_PREFIX% now, which should fix building with amd64. - Readd chdefdir's feature to switch to the new default directory after changing it. - Revert r40923 for chdefgcc.cmd. This broke switching from amd64 back to i386 (i.e. "charch amd64", "charch i386"). Furthermore, chdefgcc must not mess around with ROS_ARCH. This is exclusively charch's privilege! - Fix inability to