Remove Intel Specific CV_XADD Definition

Intel supports __atomic_fetch_add, so it isn't necessary to use
a specific version otherwise.

modules/core/include/opencv2/core/cvdef.h

@@ -418,10 +418,7 @@ Cv64suf;
 *          exchange-add operation for atomic operations on reference counters            *
 \****************************************************************************************/
 
-#if defined __INTEL_COMPILER && !(defined WIN32 || defined _WIN32)
-   // atomic increment on the linux version of the Intel(tm) compiler
-#  define CV_XADD(addr, delta) (int)_InterlockedExchangeAdd(const_cast<long*>(reinterpret_cast<volatile long*>(addr)), delta)
-#elif defined __GNUC__
+#if defined __GNUC__
 #  if defined __clang__ && __clang_major__ >= 3 && !defined __ANDROID__ && !defined __EMSCRIPTEN__ && !defined(__CUDACC__)
 #    ifdef __ATOMIC_ACQ_REL
 #      define CV_XADD(addr, delta) __c11_atomic_fetch_add((_Atomic(int)*)(addr), delta, __ATOMIC_ACQ_REL)