[issue3623] _json: fix raise_errmsg(), py_encode_basestring_ascii() and linecol()

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

_json26.patch looks good, and is necessary, because the called python
function has more than one way to raise an exception (KeyboardInterrupt
at least...)

I would just add another minor change: this raise_errmsg() function
should be made static.

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nosy: +amaury.forgeotdarc

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