Revert "Mark many packages (mostly python) broken because of broken dependencies."

This reverts commit bf86758a42.

See 71a9aa10ca25f5659a657d8910e11f36c3439a36

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

@@ -1,6 +1,6 @@
 { stdenv, fetchurl, fetchpatch, python, pkgconfig, cairo, x11, isPyPy }:
 
-stdenv.mkDerivation rec {
+if isPyPy then throw "pycairo not supported for interpreter ${python.executable}" else stdenv.mkDerivation rec {
   version = "1.10.0";
   name = "pycairo-${version}";
   src = if python.is_py3k or false
@@ -36,6 +36,4 @@ stdenv.mkDerivation rec {
   '';
   buildPhase = "${python.executable} waf";
   installPhase = "${python.executable} waf install";
-
-  meta.broken = isPyPy;
 }