virsh: avoid compiler warning on mingw
We don't use gnulib's sanitizations for vfprintf, but vshDebug was used with %zu, which means that it would fail on mingw. Thank goodness the compiler indirectly caught this for us :) virsh.c: In function 'vshDebug': virsh.c:12105:5: warning: function might be possible candidate for 'ms_printf' format attribute [-Wmissing-format-attribute] since mingw <stdio.h> hasn't yet added gcc attributes to vfprintf. * tools/virsh.c (vshDebug): Avoid vfprintf. (vshPrintExtra): Use lighter-weight fputs. Reported by Matthias Bolte.
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