bitbake -c devshell seems to have stopped working (tested with xterm
and mate-terminal) in dylan since this commit:

a749f06 terminal: Run command using a wrapper script

It looks like the run.do_devshell.<PID> script is generated but then
fails to run when passed to a terminal.

A possible clue is that after manually editing the do_devshell script
to replace:

do_terminal() {
exec pseudo /bin/bash
}

with:

do_terminal() {
exec /bin/bash
}

the script runs OK when passed to a terminal manually, such as:

$ xterm -e tmp/work/.../temp/run.do_terminal.25789