Add libfaiss runtime dependency to libcuml. (#5284)

Fixes an issue with #5281

libfaiss is required at runtime, and thus must be specified as a libcuml runtime dependency.

Authors:
  - Bradley Dice (https://github.com/bdice)
  - Corey J. Nolet (https://github.com/cjnolet)

Approvers:
  - Corey J. Nolet (https://github.com/cjnolet)
  - Charles Blackmon-Luca (https://github.com/charlesbluca)
  - Sevag H (https://github.com/sevagh)

URL: #5284

conda/recipes/libcuml/meta.yaml

@@ -88,6 +88,8 @@ outputs:
         - libraft-headers ={{ minor_version }}
         - libraft-nn ={{ minor_version }}
         - treelite {{ treelite_version }}
+        - libfaiss>=1.7.1
+        - faiss-proc=*=cuda
     about:
       home: https://rapids.ai/
       license: Apache-2.0

cpp/CMakeLists.txt

@@ -585,6 +585,8 @@ if(BUILD_CUML_CPP_LIBRARY)
 
   # These are always private:
   list(APPEND _cuml_cpp_private_libs
+    raft::raft
+    $<$<BOOL:${CUML_USE_RAFT_NN}>:faiss>
     $<TARGET_NAME_IF_EXISTS:GPUTreeShap::GPUTreeShap>
     $<$<BOOL:${LINK_CUFFT}>:CUDA::cufft${_ctk_static_suffix}>
     ${TREELITE_LIBS}
@@ -604,8 +606,6 @@ if(BUILD_CUML_CPP_LIBRARY)
   # because cumlprims_mg and cuML inherit their CUDA libs from the raft::raft
   # INTERFACE target.
   list(APPEND ${_cuml_cpp_libs_var_name}
-    raft::raft
-          $<$<BOOL:${CUML_USE_RAFT_NN}>:faiss>
     $<$<BOOL:${CUML_USE_RAFT_NN}>:raft::nn>
     $<$<BOOL:${CUML_USE_RAFT_DIST}>:raft::distance>
     $<TARGET_NAME_IF_EXISTS:cumlprims_mg::cumlprims_mg>