setup-msysgit: Also set https_proxy

The URLs for the cloned repositories are now HTTPS URLs, therefore we
need to use the proxy also for such URLs if a proxy is required for
cloning to work.

share/msysGit/net/setup-msysgit.sh

@@ -65,6 +65,7 @@ git fetch || {
 		read proxy &&
 		test ! -z "$proxy" &&
 		export http_proxy="$proxy" &&
+		export https_proxy="$proxy" &&
 		git fetch
 	} ||
 	error "Could not get msysgit.git"