Disable test_ctypes test for riscv64

======================================================================
FAIL: test_pass_by_value (ctypes.test.test_structures.StructureTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/Python-3.6.10/Lib/ctypes/test/test_structures.py", line 416, in test_pass_by_value
    self.assertEqual(s.first, 0xdeadbeef)
AssertionError: 195948557 != 3735928559
----------------------------------------------------------------------
Ran 471 tests in 22.182s
FAILED (failures=1, skipped=88)
1 test failed again:
    test_ctypes
== Tests result: FAILURE then FAILURE ==
383 tests OK.
10 slowest tests:
- test_weakref: 59 min 13 sec
- test_multiprocessing_spawn: 15 min 16 sec
- test_subprocess: 10 min 20 sec
- test_multiprocessing_forkserver: 6 min 23 sec
- test_lib2to3: 6 min 10 sec
- test_asyncio: 5 min 34 sec
- test_multiprocessing_fork: 5 min 10 sec
- test_buffer: 4 min 9 sec
- test_pickle: 4 min 7 sec
- test_io: 4 min 6 sec
1 test failed:
    test_ctypes
20 tests skipped:
    test_curses test_devpoll test_ioctl test_kqueue test_msilib
    test_ossaudiodev test_smtpnet test_socketserver test_startfile
    test_timeout test_tix test_tk test_ttk_guionly test_urllib2net
    test_urllibnet test_winconsoleio test_winreg test_winsound
    test_xmlrpc_net test_zipfile64
1 re-run test:
    test_ctypes
2 tests run no tests:
    test_dtrace test_future4
Total duration: 3 hour 42 min
Tests result: FAILURE then FAILURE
error: Bad exit status from /var/tmp/rpm-tmp.fmlas4 (%check)

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

python3.6.spec

@@ -17,7 +17,7 @@ URL: https://www.python.org/
 #global prerel ...
 %global upstream_version %{general_version}%{?prerel}
 Version: %{general_version}%{?prerel:~%{prerel}}
-Release: 5%{?dist}
+Release: 5.0.riscv64%{?dist}
 License: Python
 
 
@@ -1050,7 +1050,7 @@ CheckPython() {
     %ifarch ppc64le aarch64
     -x test_faulthandler \
     %endif
-    %ifarch %{mips64}
+    %ifarch %{mips64} riscv64
     -x test_ctypes \
     %endif
     %ifarch ppc64le
@@ -1529,6 +1529,9 @@ CheckPython optimized
 # ======================================================
 
 %changelog
+* Mon Jun 01 2020 David Abdurachmanov <david.abdurachmanov@sifive.com> - 3.6.10-5.0.riscv64
+- Disable test_ctypes test for riscv64
+
 * Thu May 28 2020 Victor Stinner <vstinner@python.org> - 3.6.10-5
 - Fix python3-config --configdir (rhbz#1772988).