databases/rocksdb: Move architecture-specific fixes into single patch file

- patch-aarch64 is merged from:
  - patch-CMakeLists.txt
  - patch-build_tools-build_detect_platform (part of)
- patch-powerpc64 is merged from:
  - patch-util_crc32c.cc
  - patch-utilities_transactions_lock_range_range__tree_lib_portability_toku__time.h