releasetools: Add support for LZMA in blockimgdiff
* Requires backports.lzma to be installed for Python2. * To enable, set WITH_LZMA_OTA to true in the build environment. * This results in significantly smaller OTA packages, which results in less $$$ being paid to deliver said OTAs. Unfortunately it is also significantly slower to decompress (parallelization may help). Change-Id: If4b8092718aa6623cfff101030eabd24cde8763c
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