Fix errors when building with GCC 4.4

--- ./src/cmdline.cc

+++ ./src/cmdline.cc

@@ -14,6 +14,7 @@

 #include <unistd.h>

 #include <stdlib.h>

+#include <stdio.h>

 #ifdef Linux

 #include <getopt.h>

 #endif

--- ./src/config.cc

+++ ./src/config.cc

@@ -85,14 +85,13 @@ int LogLevel = 0;

 int ParseIPNumber(const char *a, int *al, int *ah) 

 {

-	char *dash;

+	const char *dash;

 	if (!a || !al || !ah) return -1;

 	if (a[0] == '*') {

 		*al = 1, *ah = 254;

 	} else if ( (dash = strchr(a, '-' )) != NULL) {

-		*dash = '\0';

 		*al = atoi(a);

 		*ah = atoi(dash+1);

 	} else {