Windows: Support urls like "file:///c:/path"

That is a legal url, but parseUrl parses it to "/c:/path"
which is not a valid path on Windows. So as a workaround, use
parseURIPortable everywhere, which removes the leading slash when
run on windows.

Note that if an url is parsed like this and then serialized back
to a string, it will be different from the input. Which could
potentially be a problem, but is probably not in practice.

An alternative way to do it would be to have an uriPathPortable
that fixes up the path after parsing. But it would be harder to
make sure that is used everywhere, since uriPath is also used
when constructing an URI.

It's also worth noting that System.FilePath.normalize "/c:/path"
yields "c:/path". The reason I didn't use it is that it also
may change "/" to "\" in the path and I wanted to keep the url
changes minimal. Also noticed that convertToWindowsNativeNamespace
handles "/c:/path" the same as "c:/path".

Sponsored-By: the NIH-funded NICEMAN (ReproNim TR&D3) project

RemoteDaemon/Types.hs

@@ -15,6 +15,7 @@ import qualified Git.Types as Git
 import qualified Utility.SimpleProtocol as Proto
 import Types.GitConfig
 import Annex.ChangedRefs (ChangedRefs)
+import Utility.Url
 
 import Network.URI
 import Control.Concurrent
@@ -100,7 +101,7 @@ instance Proto.Receivable Consumed where
 
 instance Proto.Serializable RemoteURI where
 	serialize (RemoteURI u) = show u
-	deserialize = RemoteURI <$$> parseURI
+	deserialize = RemoteURI <$$> parseURIPortable
 
 instance Proto.Serializable Bool where
 	serialize False = "0"