vendored: FIX: Remove std:: before malloc and free to let them be jem…

…alloc

Since jemalloc.h does

    #  define malloc je_malloc

when JEMALLOC_MANGLE is defined, I'm getting this error in CI

    /arrow/cpp/src/arrow/vendored/ProducerConsumerQueue.h: In constructor 'arrow_vendored::folly::ProducerConsumerQueue<T>::ProducerConsumerQueue(uint32_t)':

    /arrow/cpp/src/arrow/vendored/ProducerConsumerQueue.h:82:39: error: 'je_arrow_malloc' is not a member of 'std'; did you mean 'je_arrow_malloc'?

       82 |         records_(static_cast<T*>(std::malloc(sizeof(T) * size))),

          |                                       ^~~~~~

    jemalloc_ep-prefix/src/jemalloc_ep/dist/include/jemalloc/jemalloc.h:254:32: note: 'je_arrow_malloc' declared here

      254 |     void JEMALLOC_SYS_NOTHROW *je_malloc(size_t size)

          |                                ^~~~~~~~~

    /arrow/cpp/src/arrow/vendored/ProducerConsumerQueue.h: In destructor 'arrow_vendored::folly::ProducerConsumerQueue<T>::~ProducerConsumerQueue()':

    /arrow/cpp/src/arrow/vendored/ProducerConsumerQueue.h:106:10: error: 'je_arrow_free' is not a member of 'std'; did you mean 'je_arrow_free'?

      106 |     std::free(records_);

          |          ^~~~

    jemalloc_ep-prefix/src/jemalloc_ep/dist/include/jemalloc/jemalloc.h:269:43: note: 'je_arrow_free' declared here

      269 | JEMALLOC_EXPORT void JEMALLOC_SYS_NOTHROW je_free(void *ptr)

          |                                           ^~~~~~~

Removing the std:: prefix fixes this.

cpp/src/arrow/vendored/ProducerConsumerQueue.h

@@ -79,7 +79,7 @@ struct ProducerConsumerQueue {
   // IsFull() will return true after size-1 insertions.
   explicit ProducerConsumerQueue(uint32_t size)
       : size_(size),
-        records_(static_cast<T*>(std::malloc(sizeof(T) * size))),
+        records_(static_cast<T*>(malloc(sizeof(T) * size))),
         readIndex_(0),
         writeIndex_(0) {
     assert(size >= 2);
@@ -103,7 +103,7 @@ struct ProducerConsumerQueue {
       }
     }
 
-    std::free(records_);
+    free(records_);
   }
 
   template <class... Args>