message: Delete shim of PRId64 et al. on Windows
  It should be present since MSVC 2013.
  This is a port of
  Cr-Commit-Position: refs/heads/master@{#28805}
diff: #include <inttypes.h>
  -// These are being defined without the RTC_ prefix because this is just filling
  -// the holes from what's supposed to be already present as part of the C
  -// standard, but missing on older MSVC versions.
  -
  -#if !defined(PRId64)
  -#define PRId64 "I64d"
  -#endif
  -
  -#if !defined(PRIu64)
  -#define PRIu64 "I64u"
  -#endif
  -
  -#if !defined(PRIx64)
  -#define PRIx64 "I64x"
  +#if !defined(PRId64) || !defined(PRIu64) || !defined(PRIx64)
  +#error "inttypes.h provided by win toolchain should define these."
  #endif
  // PRI*64 were added in MSVC 2013, while "%zu" is supported since MSVC 2015
  