Update Fluentd to 1.7.4 for Windows. (#247)
Update Fluentd to 1.7.4 for Windows. (#247)

Similar to https://github.com/GoogleCloudPlatform/google-fluentd/pull/245.
GoogleCloudPlatform/google-fluentd,GoogleCloudPlatform/google-fluentd,GoogleCloudPlatform/google-fluentd