Automated checkin: version bump for fennec 21.0b8 release. DONTBUILD CLOSED TREE a=release

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branch : MOBILE210b8_2013050818_RELBRANCH
Added FENNEC_21_0b8_RELEASE FENNEC_21_0b8_BUILD1 tag(s) for changeset 4ae8858aff17. DONTBUILD CLOSED TREE a=release

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branch : MOBILE210b8_2013050818_RELBRANCH