Fix _InterlockedCompareExchangePointer on x86
diff --git a/src/hb-atomic-private.hh b/src/hb-atomic-private.hh
index 918852d..a833a6c 100644
--- a/src/hb-atomic-private.hh
+++ b/src/hb-atomic-private.hh
@@ -45,7 +45,13 @@
#elif !defined(HB_NO_MT) && defined(_MSC_VER) && _MSC_VER >= 1600
#include <intrin.h>
+/* On x86, _InterlockedCompareExchangePointer is a macro defined in concrt.h */
+#if defined(_M_IX86)
+#include <concrt.h>
+#pragma intrinsic(_InterlockedExchangeAdd)
+#else
#pragma intrinsic(_InterlockedExchangeAdd, _InterlockedCompareExchangePointer)
+#endif
typedef long hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) _InterlockedExchangeAdd (&(AI), (V))
