This is exposing too much detailed information to the web. Replace it
with the string "Unspecified Version".

Bug: chromium:1354575
Change-Id: I69b8c6f7cb4eae01f806e91496664276c864309e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4574285
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Auto-Submit: Kenneth Russell <kbr@chromium.org>