[patch] Warn on va_start() when called with a reference parameter

[Nico Weber]

Hi,

it's undefined behavior to call va_start() with a reference parameter. It
happens to work fine with clang, but blows up with other compilers (e.g.
msvs), so this patch adds a warning for it. It also moves 2 other existing
warnings behind the new -Wvarargs flag.

Ok?

Nico
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