Revert "Skip inttypes.h on Darwin"

This reverts commit 1bec0c5a7e.

Breaks desktop Mac builds.

Change-Id: I5b79dc29ad544357192ed16a47279716243e51dd

vpx/vpx_integer.h

@@ -68,12 +68,7 @@ typedef size_t uintptr_t;
 #if defined(_MSC_VER) && _MSC_VER < 1800
 #define PRId64 "I64d"
 #else
-#if defined(__APPLE__)
-// When building dynamic frameworks with Swift compatibility, module maps
-// do not allow us to include the system's inttypes.h.
-#else
 #include <inttypes.h>
 #endif
-#endif
 
 #endif  // VPX_VPX_INTEGER_H_