pythonPackages.python-prctl: disabled tests causing build failure

Now disables tests using pytestCheckHook + disabledTests instead of
patch file.

Disables:
- test_speculation_ctrl
- test_mpx

Enables:
- test_mce_kill
- test_proctitle

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

@@ -2,6 +2,7 @@
 , buildPythonPackage
 , fetchPypi
 , libcap
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
@@ -13,9 +14,25 @@ buildPythonPackage rec {
     sha256 = "b4ca9a25a7d4f1ace4fffd1f3a2e64ef5208fe05f929f3edd5e27081ca7e67ce";
   };
 
-  patches = [ ./skip_bad_tests.patch ];
   buildInputs = [ libcap ];
 
+  checkInputs = [ pytestCheckHook ];
+
+  disabledTests = [
+    # Intel MPX support was removed in GCC 9.1 & Linux kernel 5.6
+    "test_mpx"
+
+    # The Nix build sandbox has no_new_privs already enabled
+    "test_no_new_privs"
+
+    # The Nix build sandbox has seccomp already enabled
+    "test_seccomp"
+
+    # This will fail if prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_FORCE_DISABLE)
+    # has been set system-wide, even outside the sandbox
+    "test_speculation_ctrl"
+  ];
+
   meta = {
     description = "Python(ic) interface to the linux prctl syscall";
     homepage = "https://github.com/seveas/python-prctl";