[Tile-serving] [openstreetmap/mod_tile] Update S3 API to use AWS authorization signature protocol V4 (#143)

[Eric Stadtherr]

@estadtherr pushed 2 commits.

cedc541  improve error checking
6db0f52  Merge remote-tracking branch 'github/s3_tile_store' into s3_api_upgrade_pr


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View it on GitHub:
https://github.com/openstreetmap/mod_tile/pull/143/files/33cc3cb168da516996297f6f7fee04e1b94a221c..6db0f526c783994588b46d7fd3727dcb3fdbe4a4
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