Fixing use of non-standard i64 literal suffix on Windows.

runtime/src/iree/base/internal/time.c

diff --git a/runtime/src/iree/base/internal/time.c b/runtime/src/iree/base/internal/time.c
index c58911d..c67a256 100644
--- a/runtime/src/iree/base/internal/time.c
+++ b/runtime/src/iree/base/internal/time.c
@@ -19,7 +19,7 @@
   // (such as using std::chrono) if older support is needed.
   FILETIME system_time;
   GetSystemTimePreciseAsFileTime(&system_time);
-  const int64_t kUnixEpochStartTicks = 116444736000000000i64;
+  const int64_t kUnixEpochStartTicks = 116444736000000000ll;
   const int64_t kFtToNanoSec = 100;
   LARGE_INTEGER li;
   li.LowPart = system_time.dwLowDateTime;