Avoid warning of unused variables

[eamanu]

BPO	36869
Nosy	@methane, @eamanu, @ZackerySpytz
PRs	bpo-36869: Avoid warning of unused variables #13182

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-09-11.05:30:38.484>
created_at = <Date 2019-05-10.00:11:13.712>
labels = ['type-feature', '3.8', 'build']
title = 'Avoid warning of unused variables'
updated_at = <Date 2019-09-11.05:30:38.484>
user = 'https://github.com/eamanu'

bugs.python.org fields:

activity = <Date 2019-09-11.05:30:38.484>
actor = 'methane'
assignee = 'none'
closed = True
closed_date = <Date 2019-09-11.05:30:38.484>
closer = 'methane'
components = ['Build']
creation = <Date 2019-05-10.00:11:13.712>
creator = 'eamanu'
dependencies = []
files = []
hgrepos = []
issue_num = 36869
keywords = []
message_count = 3.0
messages = ['342016', '342068', '351763']
nosy_count = 3.0
nosy_names = ['methane', 'eamanu', 'ZackerySpytz']
pr_nums = ['13182']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36869'
versions = ['Python 3.8']

[eamanu]

When run ./configure && make -j4 there are two warnings on
Object/dictobject.c file about ix and hash variable are not used.

Zachary Ware make me note that when _PyObject_ASSERT is call and NDEBUG
is defined that expand to ((void)0).

So this PR add a #ifndef check to avoid the warnings.

[methane]

New changeset a2fedd8 by Inada Naoki (Emmanuel Arias) in branch 'master':
bpo-36869: fix warning of unused variables (GH-13182)
a2fedd8

[ZackerySpytz]

PR 13182 has been merged, so I think this issue should be closed.