build script: provide variable whonix_build_script_currently_inside_chroot when running maybe_run_in_chroot
build script: fix, use error_handler_general instead of error_handler_unchroot_unprevent_unmount in chroot scripts
Revert "build script: provide variable whonix_build_script_currently_inside_chroot when running maybe_run_in_chroot"
Fortunately not required.
This reverts commit 0c93ef40c696573507823122da344ba1cdd94c40.
build script: added "open interactive shell" feature to error handler