python3Packages.gevent: avoid use of vendored libraries

In addition to allowing more sharing, this fixes cross-compilation.

pkgs/development/python-modules/gevent/default.nix

@@ -13,6 +13,8 @@
 , zope-event
 , zope-interface
 , pythonOlder
+, c-ares
+, libuv
 
 # for passthru.tests
 , dulwich
@@ -43,6 +45,8 @@ buildPythonPackage rec {
 
   buildInputs = [
     libev
+    libuv
+    c-ares
   ];
 
   propagatedBuildInputs = [
@@ -69,6 +73,8 @@ buildPythonPackage rec {
       pika;
   } // lib.filterAttrs (k: v: lib.hasInfix "gevent" k) python.pkgs;
 
+  GEVENTSETUP_EMBED = "0";
+
   meta = with lib; {
     description = "Coroutine-based networking library";
     homepage = "http://www.gevent.org/";