Patch for strnlen support in freevpn (for OSX 10.6)

freevpn0.029__platform__io.patch

diff --git a/platform/io.c b/platform/io.c
index 209666a..0a6c2cf 100644
--- a/platform/io.c
+++ b/platform/io.c
@@ -24,6 +24,16 @@
 #if defined(__FreeBSD__)
 #define IO_BSD
 #elif defined(__APPLE__)
+size_t strnlen(const char *s, size_t maxlen) 
+{ 
+        size_t len; 
+ 
+        for (len = 0; len < maxlen; len++, s++) { 
+                if (!*s) 
+                        break; 
+        } 
+        return (len); 
+} 
 #define IO_BSD
 #define IO_USE_SELECT
 #elif defined(WIN32)