use more standard approach for detecting long double in configure

[grimreaper]

BPO	33512
Nosy	@benjaminp, @grimreaper
PRs	bpo-33512: use standard for detecting long double #6847

^{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 2018-05-16.05:58:19.644>
created_at = <Date 2018-05-15.03:14:55.164>
labels = ['build']
title = 'use more standard approach for detecting long double in configure'
updated_at = <Date 2018-05-16.05:58:19.619>
user = 'https://github.com/grimreaper'

bugs.python.org fields:

activity = <Date 2018-05-16.05:58:19.619>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-16.05:58:19.644>
closer = 'benjamin.peterson'
components = ['Build']
creation = <Date 2018-05-15.03:14:55.164>
creator = 'eitan.adler'
dependencies = []
files = []
hgrepos = []
issue_num = 33512
keywords = ['patch']
message_count = 2.0
messages = ['316615', '316765']
nosy_count = 2.0
nosy_names = ['benjamin.peterson', 'eitan.adler']
pr_nums = ['6847']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue33512'
versions = []

[grimreaper]

autotools has a standard macro for defining HAVE_LONG_DOUBLE. Lets use it rather than using our own.

[benjaminp]

New changeset 3055c94 by Benjamin Peterson (Eitan Adler) in branch 'master':
closes bpo-33512: use standard for detecting long double (GH-6847)
3055c94