Android patch: Expose ubrk_clone() from NDK - part 1

ubrk_clone has been proposed and accepted by the upstream.
It should become @stable in the next 2 ICU releases.

ubrk_clone() is a simplified version of ubrk_safeClone(),
which isn't exposed in NDK

This function is needed by Skia to improve performance
due to repeated call of ubrk_open.

Bug: 177225118
Test: atest CtsIcu4cTestCases
Merged-In: If13dfe7730b5bfcd8737b68a588f0fc737b386e4
Change-Id: If13dfe7730b5bfcd8737b68a588f0fc737b386e4
(cherry picked from commit fbfdc3e32b1bffdd2a410b4d7693d9ee58760c20)
8 files changed