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Sometimes the value of sys.prefix (or sys.real_prefix in vpython)
includes the bin/ directory within the python installation, and
sometimes it does not. To accommodate this, check both prefix/bin and
prefix itself for the python executable.

Bug: 1049421
Change-Id: Ia7c072dc0b4b8232ec8fdce20f9211e3c978a3ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2055976
Commit-Queue: Sajjad Mirza <sajjadm@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741574}