Fix svdpi.h for apple.

Changes

@@ -41,6 +41,8 @@ indicates the contributor was also the author of the fix; Thanks!
 
 ****  Fix false UNUSED warning on file system calls.  [Holger Waechtler]
 
+****  Fix svdpi.h compile error on Apple OS.
+
 
 * Verilator 3.833 2012/04/15
 

include/vltstd/svdpi.h

@@ -27,6 +27,8 @@ typedef signed __int32 int32_t;
 typedef signed __int8 int8_t;
 #elif defined(__MINGW32__)
 #include <stdint.h>
+#elif defined(__APPLE__)
+#include <stdint.h>
 #elif defined(__linux)
 #include <inttypes.h>
 #else