mosh: use ssh from nixpkgs

pkgs/tools/networking/mosh/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, zlib, protobuf, ncurses, pkgconfig, IOTty
-, makeWrapper, perl, openssl, autoreconfHook, fetchpatch }:
+, makeWrapper, perl, openssl, autoreconfHook, openssh }:
 
 stdenv.mkDerivation rec {
   name = "mosh-1.2.6";
@@ -11,6 +11,12 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ autoreconfHook protobuf ncurses zlib pkgconfig IOTty makeWrapper perl openssl ];
 
+  patches = [ ./ssh_path.patch ];
+  postPatch = ''
+    substituteInPlace scripts/mosh.pl \
+        --subst-var-by ssh "${openssh}/bin/ssh"
+  '';
+
   postInstall = ''
       wrapProgram $out/bin/mosh --prefix PERL5LIB : $PERL5LIB
   '';

pkgs/tools/networking/mosh/ssh_path.patch

@@ -0,0 +1,13 @@
+diff --git i/scripts/mosh.pl w/scripts/mosh.pl
+index c511482..55bf5f3 100755
+--- i/scripts/mosh.pl
++++ w/scripts/mosh.pl
+@@ -66,7 +66,7 @@ my $use_remote_ip = 'proxy';
+ my $family = 'prefer-inet';
+ my $port_request = undef;
+ 
+-my @ssh = ('ssh');
++my @ssh = ('@ssh@');
+ 
+ my $term_init = 1;
+