Be more careful about extracting encoding from locale strings on Windows.

GetLocaleInfoEx() can fail on strings that setlocale() was perfectly
happy with.  A common way for that to happen is if the locale string
is actually a Unix-style string, say "et_EE.UTF-8".  In that case,
what's after the dot is an encoding name, not a Windows codepage number;
blindly treating it as a codepage number led to failure, with a fairly
silly error message.  Hence, check to see if what's after the dot is
all digits, and if not, treat it as a literal encoding name rather than
a codepage number.  This will do the right thing with many Unix-style
locale strings, and produce a more sensible error message otherwise.

Somewhat independently of that, treat a zero (CP_ACP) result from
GetLocaleInfoEx() as meaning that we must use UTF-8 encoding.

Back-patch to all supported branches.

Juan José Santamaría Flecha

Discussion: https://postgr.es/m/[email protected]

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