Merge remote-tracking branch 'aosp/icu63' into aosp/master

Update external/icu in aosp/master from ICU 62.1 to ICU 63.1

Bug: 113100098
Test: CtsLibcoreTestCases
Test: CtsLIbcoreOjTestCases
Test: CtsIcuTestCases
Test: No new failures in CtsBionicTestCases
Test: CtsTextTestCases
Change-Id: I53f8975dc95a2b36eafd6d1dcfa325b24dc31410