python_prctl is only for linux, so

- make requirements platform dependent
 - skip test_process_name in TestProcess

requirements.txt

@@ -1,5 +1,5 @@
 coverage
-python_prctl
+python_prctl;platform_system=="Linux"
 psutil
 pycrypto
 six

src/tests/test_process.py

@@ -192,6 +192,7 @@ class TestProcessShutdown(TestProcessProto):
 
 class TestProcess(TestProcessProto):
     """A test case for pybitmessage process"""
+    @unittest.skipIf(sys.platform[:5] != 'linux', 'probably needs prctl')
     def test_process_name(self):
         """Check PyBitmessage process name"""
         self.assertEqual(self.process.name(), 'PyBitmessage')