guestfs-tools: add virt-builder runtime deps

These are required to do anything useful with the program.  It tries
to run virt-resize from PATH, so $out/bin needs to be included as
well.

pkgs/tools/virtualization/guestfs-tools/default.nix

@@ -5,8 +5,10 @@
 , bison
 , cdrkit
 , cpio
+, curl
 , flex
 , getopt
+, gnupg
 , hivex
 , jansson
 , libguestfs-with-appliance
@@ -95,6 +97,7 @@ stdenv.mkDerivation rec {
   postInstall = ''
     wrapProgram $out/bin/virt-builder \
       --argv0 virt-builder \
+      --prefix PATH : ${lib.makeBinPath [ curl gnupg ]}:$out/bin \
       --suffix VIRT_BUILDER_DIRS : /etc:$out/etc
     wrapProgram $out/bin/virt-win-reg \
       --prefix PERL5LIB : ${with perlPackages; makeFullPerlPath [ hivex libintl-perl libguestfs-with-appliance ]}