Thrift: Add "#include <cstdlib>" in a few places and s/malloc/std::malloc/

Summary:
There were a few places where we were calling malloc/reallaoc/free without
including cstdlib (or stdlib.h).  This is broken, but it worked because
other headers that we were including included stdlib.h.  However, on a
platform where this wasn't true, it broke the Thrift build.  This change
adds the proper includes.  It also changes malloc to std::malloc (same
with realloc and free) in a few places, because that is the correct way
of doing it when you include cstdlib.

Reviewed By: mcslee

Test Plan: Compiled Thrift.

Revert Plan: ok

Other Notes:
This bug was noticed by a Thrudb user, and the patch was sent in by
Ross McFarland.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665487 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/src/transport/THttpClient.cpp b/lib/cpp/src/transport/THttpClient.cpp
index c213ef0..901a4e0 100644
--- a/lib/cpp/src/transport/THttpClient.cpp
+++ b/lib/cpp/src/transport/THttpClient.cpp
@@ -4,6 +4,8 @@
 // See accompanying file LICENSE or visit the Thrift site at:
 // http://developers.facebook.com/thrift/
 
+#include <cstdlib>
+
 #include "THttpClient.h"
 #include "TSocket.h"
 
@@ -54,7 +56,7 @@
 }
 
 void THttpClient::init() {
-  httpBuf_ = (char*)malloc(httpBufSize_+1);
+  httpBuf_ = (char*)std::malloc(httpBufSize_+1);
   if (httpBuf_ == NULL) {
     throw TTransportException("Out of memory.");
   }
@@ -63,7 +65,7 @@
 
 THttpClient::~THttpClient() {
   if (httpBuf_ != NULL) {
-    free(httpBuf_);
+    std::free(httpBuf_);
   }
 }
 
@@ -202,7 +204,7 @@
   uint32_t avail = httpBufSize_ - httpBufLen_;
   if (avail <= (httpBufSize_ / 4)) {
     httpBufSize_ *= 2;
-    httpBuf_ = (char*)realloc(httpBuf_, httpBufSize_+1);
+    httpBuf_ = (char*)std::realloc(httpBuf_, httpBufSize_+1);
     if (httpBuf_ == NULL) {
       throw TTransportException("Out of memory.");
     }