bpo-13497: Fix broken nice configure test

[ngie-eign]

Per POSIX, nice(3) requires unistd.h and exit(3) requires stdlib.h.

Fixing the test will prevent false positives with pedantic compilers,
like clang.

bpo-13497

Signed-off-by: Enji Cooper yaneurabeya@gmail.com

https://bugs.python.org/issue13497

[miss-islington]

Thanks @ngie-eign for the PR, and @benjaminp for merging it 🌮🎉.. I'm working now to backport this PR to: 2.7, 3.7.
🐍🍒⛏🤖

[bedevere-bot]

GH-12042 is a backport of this pull request to the 3.7 branch.

[bedevere-bot]

GH-12043 is a backport of this pull request to the 2.7 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot PPC64LE Fedora 3.x has failed when building commit 90c6fac.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/85/builds/2209) and take a look at the build logs.
4. Check if the failure is related to this commit (90c6fac) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/85/builds/2209

Click to see traceback logs

Traceback (most recent call last):
  File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64le/build/Lib/test/test_descr.py", line 4341, in test_vicious_descriptor_nonsense
    self.assertEqual(c.attr, 1)
  File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64le/build/Lib/test/test_descr.py", line 4328, in __eq__
    del C.attr
AttributeError: attr

----------------------------------------------------------------------

Ran 140 tests in 2.609s

FAILED (errors=1, expected failures=2)


Traceback (most recent call last):
  File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64le/build/Lib/test/test_descr.py", line 4341, in test_vicious_descriptor_nonsense
    self.assertEqual(c.attr, 1)
  File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64le/build/Lib/test/test_descr.py", line 4328, in __eq__
    del C.attr
AttributeError: attr

----------------------------------------------------------------------

Ran 140 tests in 2.548s

FAILED (errors=1, expected failures=2)

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot PPC64 Fedora 3.x has failed when building commit 90c6fac.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/53/builds/2385) and take a look at the build logs.
4. Check if the failure is related to this commit (90c6fac) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/53/builds/2385

Click to see traceback logs

Traceback (most recent call last):
  File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64/build/Lib/test/test_descr.py", line 4341, in test_vicious_descriptor_nonsense
    self.assertEqual(c.attr, 1)
  File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64/build/Lib/test/test_descr.py", line 4328, in __eq__
    del C.attr
AttributeError: attr

----------------------------------------------------------------------

Ran 140 tests in 5.998s

FAILED (errors=1, expected failures=2)


Traceback (most recent call last):
  File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64/build/Lib/test/test_descr.py", line 4341, in test_vicious_descriptor_nonsense
    self.assertEqual(c.attr, 1)
  File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64/build/Lib/test/test_descr.py", line 4328, in __eq__
    del C.attr
AttributeError: attr

----------------------------------------------------------------------

Ran 140 tests in 3.856s

FAILED (errors=1, expected failures=2)