[CMake] ExternalProject git checkout --depth=1 ???

[Kent Williams]

I'm building the Mozilla Spidermonkey JS interpreter as an ExternalProject.

So far so good, but I had a question/feature request:  Wouldn't it be grand
to be able to add --depth 1 to the git clone?  This is perfect for grabbing
giant repositories.  Mozilla is more than 3 gigabytes with a full clone,
and a depth=1 checkout is a 1/3 that.
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