Have doclava emit meaningful stack traces.

This flag enables stack traces when invoking doclava, which were
otherwise being truncated to simply be the exception name, which was
useless for debugging things.

Test: make -j32 online-system-api-sdk-docs
Bug: 38164929
Change-Id: Ie281e2b2ed988bb6d587af33256fcdee1450fc79
1 file changed