Fixed d8 on leopard.

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 2bb9665374a0401ebce69ae473d2e0c650aa98f9..96ef899bc429f84fd5956de92b23aaa13c2e951b 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -185,11 +185,16 @@ void OS::StrNCpy(Vector<char> dest, const char* src, size_t n) {
 }
 
 
-char *OS::StrDup(const char* str) {
+char* OS::StrDup(const char* str) {
   return strdup(str);
 }
 
 
+char* OS::StrNDup(const char* str, size_t n) {
+  return strndup(str, n);
+}
+
+
 double OS::nan_value() {
   return NAN;
 }