ps: ignore SIGCONT

SIGCONT is a continue signal.  It seems that some zsh setups can send
this signal, causing ps to abort.  This is not what "continue" means.
This change just uses the default handler which will continue a stopped
process.

References:
  http://bugs.debian.org/732410
  http://www.zsh.org/cgi-bin/mla/redirect?WORKERNUMBER=32251

Signed-off-by: Craig Small <csmall@enc.com.au>

NEWS

@@ -1,6 +1,7 @@
 procps-ng-3.3.10
 ----------------
   * sysctl --system loads default config file - Debian #732920
+  * ps doesn't exit on SIGCONT
 
 procps-ng-3.3.9
 ---------------

ps/display.c

@@ -563,6 +563,7 @@ int main(int argc, char *argv[]){
     default:
       sigaction(i,&sa,NULL);
     case 0:
+    case SIGCONT:
     case SIGINT:   /* ^C */
     case SIGTSTP:  /* ^Z */
     case SIGTTOU:  /* see stty(1) man page */