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Previously we were using va_list for variadic arguments. The downside
for this was that only the first value from the variadic argument was
passed to the original function.

To make it work properly we have to use the __VA_ARGS__ variadic macro
that was introduces in C99 and is available in all major C/C++
compilers.

Change-Id: I50652f7348a16214811aaab8af116d78cdb70444
Reviewed-on: https://chromium-review.googlesource.com/c/1323089Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Tomáš Popela <tomas.popela@gmail.com>
Cr-Commit-Position: refs/heads/master@{#606588}