Fix INADDR_NONE value (for systems which don't define it).

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1884 f882894a-f735-0410-b71e-b25c423dba1c

plugins-root/check_icmp.c

@@ -84,7 +84,7 @@ const char *email = "nagiosplug-devel@lists.sourceforge.net";
 # define MAXTTL	255
 #endif
 #ifndef INADDR_NONE
-# define INADDR_NONE 0xffffffU
+# define INADDR_NONE (in_addr_t)(-1)
 #endif
 
 #ifndef SOL_IP