Fix build with aws-0.17.

This commit was sponsored by Denis Dzyubenko on Patreon.

CHANGELOG

@@ -1,6 +1,7 @@
 git-annex (6.20171004) UNRELEASED; urgency=medium
 
   * webdav: Make --debug show all webdav operations.
+  * Fix build with aws-0.17.
 
  -- Joey Hess <id@joeyh.name>  Sat, 07 Oct 2017 14:11:00 -0400
 

Remote/S3.hs

@@ -497,6 +497,9 @@ withS3HandleMaybe c gc u a = do
 		Just creds -> do
 			awscreds <- liftIO $ genCredentials creds
 			let awscfg = AWS.Configuration AWS.Timestamp awscreds debugMapper
+#ifdef MIN_VERSION_aws(0,11,0)
+				Nothing
+#endif
 			bracketIO (newManager managerSettings) closeManager $ \mgr -> 
 				a $ Just $ S3Handle mgr awscfg s3cfg
 		Nothing -> a Nothing

doc/bugs/Cannot_build_with_aws_0.17.1.mdwn

@@ -43,3 +43,5 @@ Full build log is here: https://gist.github.com/ilovezfs/661a158dbe8aac33802f9b4
 ### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)
 
 Yes! :)
+
+> [[fixed|done]] --[[Joey]]

stack.yaml

@@ -17,7 +17,7 @@ flags:
 packages:
 - '.'
 extra-deps:
-- aws-0.16
+- aws-0.17.1
 - bloomfilter-2.0.1.0
 - torrent-10000.1.1
 - yesod-default-1.2.0