Squashed 'icu/' changes from 28d9e0e..19aef60

19aef60 import from upstram tarball icu4c-4_6_1-src.tgz

git-subtree-dir: icu
git-subtree-split: 19aef609893d7891532c8169c27a4449c3ea7bd6
Merge commit 'aea1aaed7f5fe52e41afb3aa1718fd6d485956ca'
[packaging] bump packaging version to true 4.6.1