avoid using tmpnam() in Lua

Change-Id: I9e3d82445bb26b98ff6a60dff28f9655cc9ea1fb
Reviewed-on: https://skia-review.googlesource.com/102624
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed