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 {