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GH-34206: [C++] Don't let jemalloc defines affect unity builds (#34185)

Since `jemalloc.h` does

    #  define malloc je_malloc

when `JEMALLOC_MANGLE` is defined, we can get this error in CI during an
unity build

    /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)

          |                                           ^~~~~~~

* Closes: #34206

Authored-by: Felipe Oliveira Carvalho <felipekde@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>