fix: Use long long literals for msvc compiler. (#325)
fix: Use long long literals for msvc compiler. (#325)

MSVC uses 32-bits for "long":
https://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models
googleapis/google-cloud-cpp-spanner,googleapis/google-cloud-cpp-spanner,googleapis/google-cloud-cpp-spanner,googleapis/google-cloud-cpp-spanner