%c format does not accept large numbers on ucs-2 builds

[amauryfa]

BPO	3280
Nosy	@amauryfa

^{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 2008-07-04.21:31:38.123>
created_at = <Date 2008-07-04.09:02:02.202>
labels = ['type-bug', 'expert-unicode']
title = '%c format does not accept large numbers on ucs-2 builds'
updated_at = <Date 2008-07-04.21:31:38.099>
user = 'https://github.com/amauryfa'

bugs.python.org fields:

activity = <Date 2008-07-04.21:31:38.099>
actor = 'amaury.forgeotdarc'
assignee = 'none'
closed = True
closed_date = <Date 2008-07-04.21:31:38.123>
closer = 'amaury.forgeotdarc'
components = ['Unicode']
creation = <Date 2008-07-04.09:02:02.202>
creator = 'amaury.forgeotdarc'
dependencies = []
files = []
hgrepos = []
issue_num = 3280
keywords = []
message_count = 2.0
messages = ['69247', '69268']
nosy_count = 1.0
nosy_names = ['amaury.forgeotdarc']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue3280'
versions = ['Python 3.0']

[amauryfa]

Since python3.0, chr(0x2f81a) works even on narrow Unicode builds, but 
>>> "%c" % 0x2f81a
OverflowError: %c arg not in range(0x10000) (narrow Python build)

Likewise, Py_BuildValue("C") should accept codes outside the BMP.

[amauryfa]

Committed as r64717.