Avoid trying to include <asm/atomic.h> when it doesn't work in C++ code. (Bug #13621)
Avoid trying to include <asm/atomic.h> when it doesn't work in C++
code. (Bug #13621)


configure.in:
  Test whether atomic_add() and atomic_sub() are available in C++
  code, since that is primarily where we will be using them.

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