fix(core): fix system header imports #585

Job	Run time
Unit Test (AWSAPIGateway)	4m 30s
Unit Test (AWSAutoScaling)	3m 53s
Unit Test (AWSCloudWatch)	3m 25s
Unit Test (AWSCognitoAuth)	4m 6s
Unit Test (AWSCognitoIdentityProvider)	6m 5s
Unit Test (AWSComprehend)	4m 38s
Unit Test (AWSConnect)	3m 10s
Unit Test (AWSConnectParticipant)	3m 14s
Unit Test (AWSCore)	6m 41s
Unit Test (AWSDynamoDB)	4m 24s
Unit Test (AWSEC2)	4m 38s
Unit Test (AWSElasticLoadBalancing)	3m 13s
Unit Test (AWSIoT)	3m 51s
Unit Test (AWSKMS)	2m 57s
Unit Test (AWSKinesis)	3m 49s
Unit Test (AWSKinesisVideo)	3m 6s
Unit Test (AWSKinesisVideoArchivedMedia)	3m 18s
Unit Test (AWSKinesisVideoSignaling)	3m 23s
Unit Test (AWSKinesisVideoWebRTCStorage)	3m 14s
Unit Test (AWSLambda)	2m 55s
Unit Test (AWSLex)	4m 6s
Unit Test (AWSLogs)	4m 39s
Unit Test (AWSMachineLearning)	2m 56s
Unit Test (AWSMobileClient)	5m 36s
Unit Test (AWSPinpoint)	3m 35s
Unit Test (AWSPolly)	4m 19s
Unit Test (AWSRekognition)	3m 1s
Unit Test (AWSS3)	5m 48s
Unit Test (AWSSES)	3m 35s
Unit Test (AWSSNS)	2m 59s
Unit Test (AWSSQS)	4m 16s
Unit Test (AWSSageMakerRuntime)	4m 22s
Unit Test (AWSSimpleDB)	2m 53s
Unit Test (AWSTextract)	4m 7s
Unit Test (AWSTranscribe)	5m 0s
Unit Test (AWSTranscribeStreaming)	3m 45s
Unit Test (AWSTranslate)	3m 3s
Unit Test (AWSLocation)	5m 52s
Unit Test (AWSChimeSDKMessaging)	4m 1s
Unit Test (AWSChimeSDKIdentity)	3m 0s
	2h 39m 23s

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