remove explicit-setup-deps

This has not been needed since stack <1.4.0, and even the i386ancent
build uses stack 2.1.1.

Stack 2.7.5 seems to have forgotten about this old config and warns
about it, so this avoids that warning.

The libtinfo-dev was added to the docs at the same time, I assume it is
also not necessary.

doc/install/fromsource.mdwn

@@ -41,7 +41,7 @@ and avoids build failures due to fast-changing haskell libraries.
 First, [install stack](https://github.com/commercialhaskell/stack/blob/master/doc/install_and_upgrade.md)
 On Debian:
 
-	sudo apt-get install haskell-stack zlib1g-dev libtinfo-dev
+	sudo apt-get install haskell-stack zlib1g-dev
 
 Get the git-annex source code, and inside the source tree run:
 

stack.yaml

@@ -22,5 +22,3 @@ extra-deps:
 - network-multicast-0.3.2
 - sandi-0.5
 - torrent-10000.1.1
-explicit-setup-deps:
-  git-annex: true