Fabian Homborg 0bde698f81 printf: Don't die on incomplete conversions ...

POSIX dictates here that incomplete conversions, like in

    printf %d\n 15.2

or

    printf %d 14g

are still printed along with any error.

This seems alright, as it allows users to silence stderr to accept incomplete conversions.

This commit implements it, but what's a bit weird is the ordering between stdout and stderr,
causing the error to be printed _after_, like

    15
    14
    15.1: value not completely converted
    14,2: value not completely converted

but that seems like a general issue with how we buffer the streams.

(I know that nonfatal_error is a copy of most of fatal_error - I tried
differently, and va_* is weird)

Fixes #5532.

2019-03-17 17:00:55 +01:00

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