devel/aws-c-io: Update to 1.0.0

CMakeLists.txt looks for AwsGetVersion.cmake from the installed
aws-c-common before project() runs, so LOCALBASE was not searched.
Use USES=localbase, which exports CMAKE_PREFIX_PATH to the environment.

ChangeLog: https://github.com/awslabs/aws-c-io/releases/tag/v1.0.0