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);