Fixed build_distribution.sh to remove previous build attempts.
Fixed build_distribution.sh to remove previous build attempts.

	Change on 2016/10/13 by tball <tball@google.com>

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=136075756

life-beam/j2objc,mirego/j2objc,google/j2objc,mirego/j2objc,bandcampdotcom/j2objc,lukhnos/j2objc,groschovskiy/j2objc,mirego/j2objc,groschovskiy/j2objc,bandcampdotcom/j2objc,groschovskiy/j2objc,doppllib/j2objc,lukhnos/j2objc,google/j2objc,groschovskiy/j2objc,doppllib/j2objc,life-beam/j2objc,life-beam/j2objc,bandcampdotcom/j2objc,life-beam/j2objc,google/j2objc,life-beam/j2objc,lukhnos/j2objc,lukhnos/j2objc,doppllib/j2objc,bandcampdotcom/j2objc,google/j2objc,life-beam/j2objc,groschovskiy/j2objc,mirego/j2objc,google/j2objc,lukhnos/j2objc,doppllib/j2objc,bandcampdotcom/j2objc,doppllib/j2objc,groschovskiy/j2objc,lukhnos/j2objc,mirego/j2objc,google/j2objc,doppllib/j2objc,mirego/j2objc,bandcampdotcom/j2objc