#6 py-pychecker-run uses xemacs function

[Matthias Klose]

[forwarded from http://bugs.debian.org/209723\]

py-pychecker-run does not work with emacs21 complaining:
Symbol's function definition is void: read-shell-command

This is discussed in the thread
http://groups.google.com/groups?th=10014eaf8722c8cc
in which Skip recommends replacing read-shell-command
with read-string.