Expose NCURSES_EXT_FUNCS under curses

[isidentical]

BPO	40207
Nosy	@Yhg1s, @isidentical
PRs	gh-84388: Expose NCURSES_EXT_FUNCS #19392

^{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 = None
created_at = <Date 2020-04-06.15:55:12.447>
labels = ['library', '3.9']
title = 'Expose NCURSES_EXT_FUNCS under curses'
updated_at = <Date 2020-04-11.01:17:09.377>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2020-04-11.01:17:09.377>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-04-06.15:55:12.447>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 40207
keywords = ['patch']
message_count = 1.0
messages = ['365866']
nosy_count = 2.0
nosy_names = ['twouters', 'BTaskaya']
pr_nums = ['19392']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue40207'
versions = ['Python 3.9']

[isidentical]

NCURSES_EXT_FUNCS defines the extension version number which is needed to determine if certain functions exist or not.

[serhiy-storchaka]

Unless ncurses is configured with --disable-ext-funcs, it sets NCURSES_EXT_FUNCS to the same value as curses.ncurses_version.patch. Also, in Python we can use hasattr() to test whether extension functions are available. Do we still need curses.NCURSES_EXT_FUNCS?

[serhiy-storchaka]

See also #123925. NCURSES_EXT_FUNCS itself is not so useful.