compile_single_file.py doesn't support Jumbo build because compiling a
single file goes against the concept of Jumbo builds (where files get
merged together).

Change-Id: Ib53dc22ed8b61839dc936e8e20f7febbb477eff8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1657789Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>