lcdproc: backport upstream patches

Backport some lcdproc patches from upstream, to fix the following issues.

  * Incorrect parsing of minus key in handler for client_add_key command
  * Segfault in handler for menu_add_item command

Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>