Add LL to large constant

Some compiler will report: 'error: integer constant is too large for long type'

src/google/protobuf/util/internal/constants.h

@@ -50,16 +50,16 @@ const char kRfc3339TimeFormat[] = "%E4Y-%m-%dT%H:%M:%S";
 const char kRfc3339TimeFormatNoPadding[] = "%Y-%m-%dT%H:%M:%S";
 
 // Minimun seconds allowed in a google.protobuf.Timestamp value.
-const int64 kTimestampMinSeconds = -62135596800;
+const int64 kTimestampMinSeconds = -62135596800LL;
 
 // Maximum seconds allowed in a google.protobuf.Timestamp value.
-const int64 kTimestampMaxSeconds = 253402300799;
+const int64 kTimestampMaxSeconds = 253402300799LL;
 
 // Minimum seconds allowed in a google.protobuf.Duration value.
-const int64 kDurationMinSeconds = -315576000000;
+const int64 kDurationMinSeconds = -315576000000LL;
 
 // Maximum seconds allowed in a google.protobuf.Duration value.
-const int64 kDurationMaxSeconds = 315576000000;
+const int64 kDurationMaxSeconds = 315576000000LL;
 
 // Nano seconds in a second.
 const int32 kNanosPerSecond = 1000000000;