Revert "[FFI][CMAKE] Add missing download path for libbacktrace" #18250
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This PR reverts #18246.
As mentioned in #18246 (comment), it seems that libbacktrace will be re-configured every time and
ffi/src/ffi/traceback.ccwill be compiled when we runmake, even if there is no changes. This repetitive compilation increases the compilation time by a lot.