Get Rid of Old Libunwind Patches to Improve Clang Build Performance

Get rid of old libunwind patches. https://github.com/ClickHouse-Extras/libunwind/commit/500aa227911bd185a94bfc071d68f4d3b03cb3b1#r39048012 This allows to disable -fno-omit-frame-pointer in clang builds that improves performance at least by 1% in average. #10761 (Amos Bird).