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We spent a while figuring out how and why mini_installer.exe avoids
pulling in the C run-time and I wanted to make sure it was working
correctly and was slightly better documented. This just adds some
comments, for future generations.

Bug: 934032
Change-Id: I917a7532d6d8e92a21d58e9cedf0af44fee488ed
Reviewed-on: https://chromium-review.googlesource.com/c/1481956
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634753}