build error when trying to use RocksCacheLibWrapper code example

[gaowayne]

Describe the bug A clear and concise description of what the bug is. build error, missing key files to leverage RocksCacheLibWrapper

To Reproduce Steps to reproduce the behavior:

1. build one small app, make RocksCacheLibWrapper as RocksDB 2nd cache. but I saw the build error for my example code, looks like this RocksCacheLibWrapper code is broken.

[ 33%] Building CXX object CMakeFiles/rocksdb_cachelib_example.dir/main.cpp.o
In file included from /mnt/nvme0n1/rocksdb/rocksdb_cachelib_example/main.cpp:7:
/mnt/nvme0n1/rocksdb/rocksdb_cachelib_example/rocks_secondary_cache/CachelibWrapper.h:19:10: fatal error: cachelib/facebook/admin/CacheAdmin.h: No such file or directory
   19 | #include "cachelib/facebook/admin/CacheAdmin.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/rocksdb_cachelib_example.dir/build.make:76: CMakeFiles/rocksdb_cachelib_example.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/rocksdb_cachelib_example.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

Expected behavior A clear and concise description of what you expected to happen. there is great example to show how rocksdb 2nd cache talk to cachelib Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS] FedoraOS40
• Browser [e.g. chrome, safari] Chrome
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.