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

@@ -95,7 +95,7 @@ int ParseIPNumber(const char *a, int *al, int *ah)

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

         *al = 1, *ah = 254;

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

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

         *dash = '\0';

         *al = atoi(a);

         *ah = atoi(dash+1);