lesstif mwm bug

[Hans Werner Strube]

The mwm from lesstif eats up 99 % of CPU time, both in the binary package
and in a self-compiled version. I found that the select() calls in events.c
do not wait but immediately fail with errno = EBADF, although fd_width is 256
and x_fd is 3 or 4 (printed out in mwm.c). I have not yet found the reason,
only a dirty workaround: Replace the select by usleep(10000).