Support building ldb with buck (#12676)

Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12676

The patch extends the RocksDB buckifier script so it also creates a `buck` target for the `ldb` tool and updates the `TARGETS` file with the results of the new version of the script.

Reviewed By: cbi42

Differential Revision: D57588789

fbshipit-source-id: 2ed58b405b3f216e802cf6bcbdbf9809e7386c8b

TARGETS

@@ -410,6 +410,8 @@ rocks_cpp_library_wrapper(name="rocksdb_stress_lib", srcs=[
     ], headers=None)
 
 
+cpp_binary_wrapper(name="ldb", srcs=["tools/ldb.cc"], deps=[":rocksdb_tools_lib"], extra_preprocessor_flags=[], extra_bench_libs=False)
+
 cpp_binary_wrapper(name="db_stress", srcs=["db_stress_tool/db_stress.cc"], deps=[":rocksdb_stress_lib"], extra_preprocessor_flags=[], extra_bench_libs=False)
 
 cpp_binary_wrapper(name="cache_bench", srcs=["cache/cache_bench.cc"], deps=[":rocksdb_cache_bench_tools_lib"], extra_preprocessor_flags=[], extra_bench_libs=False)

buckifier/buckify_rocksdb.py

@@ -193,6 +193,10 @@ def generate_targets(repo_path, deps_map):
         + src_mk.get("STRESS_LIB_SOURCES", [])
         + ["test_util/testutil.cc"],
     )
+    # ldb binary
+    TARGETS.add_binary(
+        "ldb", ["tools/ldb.cc"], [":rocksdb_tools_lib"]
+    )
     # db_stress binary
     TARGETS.add_binary(
         "db_stress", ["db_stress_tool/db_stress.cc"], [":rocksdb_stress_lib"]