[bug #40227] Various fixes for MSVC build of 4.0

[Christian Boos]

Follow-up Comment #10, bug #40227 (project make):

... and I just debugged the make built with the MinGW-w64 
toolchain for x64 and *without* the -D__USE_MINGW_ANSI_STDIO=1
flag, the problem is indeed that vsnprintf returns -1 when the
fmtbuf is not large enough.

Also, I must have forgotten to revert my patch when I built 
the 32-bits version earlier, as now I can also reproduce the
problem with also with make built with the MinGW-w64 x32
toolchain.

Bottom line: the mingw.org toolchain probably enables
the ANSI-like behavior by default, whereas the MinGW-w64
toolchains needs the -D__USE_MINGW_ANSI_STDIO=1 flag
for that.

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