Fixed centos installer bugs.

tbrehm

2009-02-27 76f1973448c7dc481f0cf2b1d2b02d9a65c4066c

 install/lib/install.lib.php

@@ -558,7 +558,7 @@
}

function is_installed($appname) {
   exec('which '.escapeshellcmd($appname),$out);
   exec('which '.escapeshellcmd($appname).' > /dev/null 2> /dev/null',$out);
   if(isset($out[0]) && stristr($out[0],$appname)) {
      return true;
   } else {