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Require Visual Studio 2015 or later; fail if we don't have it, and
remove checks for older versions.
That means we have C99-compliant snprintf() and vsnprintf(); require
them when configuring for UN*X, and then use them directly, rather than
having wrappers for systems lacking them.
If we're using MSVC, skip the tests for options to request C99
compatibility - either we have VS 2015, which is sufficient, or we
don't, in which case we fail.
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This lets us get rid of places where we calculate the length that a
formatted string will require, attempt to allocate a buffer for the
string, and then format the string into that buffer; this way, we don't
have to hope we got the calculation correct, we rely on the same code
that formats strings to do the calculation.
Provide versions of asprintf() for:
1) Windows and the MSVC runtime, where we use _vscprintf() to determine
the length;
2) systems that have (what is presumed to be) an snprintf() that, when
handed a too-short buffer, returns the number of characters that would
have been written had the buffer been long enough (as C99 specifies),
where we format to a one-character buffer to determine the length;
3) systems that don't have snprintf(), where we use the asprintf()
provided by the missing/snprintf.c file that also provides snprintf().
While we're at it, include "portability.h" in missing/win_snprintf.c, to
get declaration/definition checking done.
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