[libunwind] Remove -Wsign-conversion warning

Reland after dependent change reland.

NOKEYCHECK=True
GitOrigin-RevId: d3a6f5739130409602edac1b6588613c458d7321
1 file changed
tree: 620f5ee9a3017dc1b65539a09c7cc31304a4d52a
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT