Remove references to expat from toolchain/build/configure.
Bug: http://b/21907643 Change-Id: I91cfcbaa1c403ce6ef047f049cb2c623dde6e05e
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Bug: http://b/21907643 Change-Id: I91cfcbaa1c403ce6ef047f049cb2c623dde6e05e
mentioned in commit 79b5701f