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/protocol/TBinaryProtocol.cpp b/lib/cpp/src/protocol/TBinaryProtocol.cpp
index 929499b..b3e9fbc 100644
--- a/lib/cpp/src/protocol/TBinaryProtocol.cpp
+++ b/lib/cpp/src/protocol/TBinaryProtocol.cpp
@@ -406,7 +406,7 @@
 
   // Use the heap here to prevent stack overflow for v. large strings
   if (size > string_buf_size_ || string_buf_ == NULL) {
-    string_buf_ = (uint8_t*)realloc(string_buf_, (uint32_t)size);
+    string_buf_ = (uint8_t*)std::realloc(string_buf_, (uint32_t)size);
     if (string_buf_ == NULL) {
       string_buf_size_ = 0;
       throw TProtocolException(TProtocolException::UNKNOWN, "Out of memory in TBinaryProtocol::readString");