fixed a mistake on reverting my previous patch:

http://git.php.net/?p=php-src.git;a=commitdiff;h=50b2e02c045b61f99e8c72d54e6bec055aee98e4

Author: hirokawa

ext/standard/exec.c

@@ -272,8 +272,8 @@ PHPAPI char *php_escape_shell_cmd(char *str)
 					p = NULL;
 				} else {
 					cmd[y++] = '\\';
-					cmd[y++] = str[x];
 				}
+				cmd[y++] = str[x];
 				break;
 #else
 			/* % is Windows specific for enviromental variables, ^%PATH% will