Modify vulcanize rule to allow skipping Crisper
Modify vulcanize rule to allow skipping Crisper

This change adds a patch shamelessly stolen from David Ostrovsky that
allows for passing of split=False to the vulcanize build rule.

This does not change the current functionality of the PG build system,
but this new parameter will be used in a later change to build the
codemirror plugin.

Bug: Issue 4437
Change-Id: Idc2b21c3094b63713dffb84efcbee677acb64082

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